Security Guide: removing Mass Assignment.

Since mass assignment doesn't exist anymore, we don't need to discuss it.

I checked with @fxn last night before making this change.
use default_options= instead of default to avoid confusion
Globalize2 is only compatible with Rails 2 so link to Globalize3 instead
Add test case for scaffold_controller generator without attributes.

This is a test for 978c568a7bffe354180aaefa471092182fed1015
Use the references and belongs_id ids in the scaffold_controller
generator
Add quotes to Numeric Passwords to force string(Postgres)

If you have numeric password for your database, like below:
```yaml
development:
  adapter: mysql2
  encoding: utf8
  database: myblog_development
  pool: 5
  username: root
  password: 123456
```
you will get the following obscure error with unhelpful stack-trace

```shell
$ c
/home/gaurish/.rvm/gems/ruby-1.9.3-p286-perf/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `connect': can't convert Fixnum into String (TypeError)
        from /home/gaurish/.rvm/gems/ruby-1.9.3-p286-perf/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `initialize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `new'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `mysql2_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:444:in `new_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:454:in `checkout_new_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:425:in `acquire_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:362:in `block in checkout'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `checkout'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:271:in `block in connection'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:270:in `connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:545:in `retrieve_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_handling.rb:79:in `retrieve_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_handling.rb:53:in `connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/railtie.rb:153:in `block in <class:Railtie>'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:30:in `instance_exec'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:30:in `run'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:55:in `block in run_initializers'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:150:in `block in tsort_each'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:219:in `each_strongly_connected_component_from'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:182:in `block in each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:180:in `each'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:180:in `each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:148:in `tsort_each'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:54:in `run_initializers'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:216:in `initialize!'
        from /home/gaurish/code/repo/rails/railties/lib/rails/railtie/configurable.rb:30:in `method_missing'
        from /tmp/numericpass/config/environment.rb:5:in `<top (required)>'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:190:in `require'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:190:in `require_environment!'
        from /home/gaurish/code/repo/rails/railties/lib/rails/commands.rb:70:in `<top (required)>'
        from script/rails:6:in `require'
        from script/rails:6:in `<main>'
```
Looking [Can't convert fixnum to string during rake db:create](http://stackoverflow.com/questions/3765834/cant-convert-fixnum-to-string-during-rake-dbcreate), it seems lot of people have faced the same error. 

so adding a note informing about numeric passwords seems like a good idea
Add quotes to Numeric Passwords to force string(MySql)

If you have numeric password for your database, like below:
```yaml
development:
  adapter: mysql2
  encoding: utf8
  database: myblog_development
  pool: 5
  username: root
  password: 123456
```
you will get the following obscure error with unhelpful stack-trace

```shell
$ c
/home/gaurish/.rvm/gems/ruby-1.9.3-p286-perf/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `connect': can't convert Fixnum into String (TypeError)
        from /home/gaurish/.rvm/gems/ruby-1.9.3-p286-perf/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `initialize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `new'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `mysql2_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:444:in `new_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:454:in `checkout_new_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:425:in `acquire_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:362:in `block in checkout'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `checkout'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:271:in `block in connection'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:270:in `connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:545:in `retrieve_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_handling.rb:79:in `retrieve_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_handling.rb:53:in `connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/railtie.rb:153:in `block in <class:Railtie>'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:30:in `instance_exec'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:30:in `run'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:55:in `block in run_initializers'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:150:in `block in tsort_each'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:219:in `each_strongly_connected_component_from'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:182:in `block in each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:180:in `each'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:180:in `each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:148:in `tsort_each'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:54:in `run_initializers'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:216:in `initialize!'
        from /home/gaurish/code/repo/rails/railties/lib/rails/railtie/configurable.rb:30:in `method_missing'
        from /tmp/numericpass/config/environment.rb:5:in `<top (required)>'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:190:in `require'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:190:in `require_environment!'
        from /home/gaurish/code/repo/rails/railties/lib/rails/commands.rb:70:in `<top (required)>'
        from script/rails:6:in `require'
        from script/rails:6:in `<main>'
```
Looking [Can't convert fixnum to string during rake db:create](http://stackoverflow.com/questions/3765834/cant-convert-fixnum-to-string-during-rake-dbcreate), it seems lot of people have faced the same error.

so adding a note informing about numeric passwords seems like a good idea
Add quotes to Numeric Passwords to force string(jdbcpostgresql)

If you have numeric password for your database, like below:
```yaml
development:
  adapter: mysql2
  encoding: utf8
  database: myblog_development
  pool: 5
  username: root
  password: 123456
```


you will get the following obscure error with unhelpful stack-trace

```shell
/home/gaurish/.rvm/gems/ruby-1.9.3-p286-perf/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `connect': can't convert Fixnum into String (TypeError)
        from /home/gaurish/.rvm/gems/ruby-1.9.3-p286-perf/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `initialize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `new'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `mysql2_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:444:in `new_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:454:in `checkout_new_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:425:in `acquire_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:362:in `block in checkout'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `checkout'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:271:in `block in connection'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:270:in `connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:545:in `retrieve_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_handling.rb:79:in `retrieve_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_handling.rb:53:in `connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/railtie.rb:153:in `block in <class:Railtie>'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:30:in `instance_exec'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:30:in `run'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:55:in `block in run_initializers'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:150:in `block in tsort_each'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:219:in `each_strongly_connected_component_from'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:182:in `block in each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:180:in `each'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:180:in `each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:148:in `tsort_each'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:54:in `run_initializers'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:216:in `initialize!'
        from /home/gaurish/code/repo/rails/railties/lib/rails/railtie/configurable.rb:30:in `method_missing'
        from /tmp/numericpass/config/environment.rb:5:in `<top (required)>'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:190:in `require'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:190:in `require_environment!'
        from /home/gaurish/code/repo/rails/railties/lib/rails/commands.rb:70:in `<top (required)>'
        from script/rails:6:in `require'
        from script/rails:6:in `<main>'
```
Looking [Can't convert fixnum to string during rake db:create](http://stackoverflow.com/questions/3765834/cant-convert-fixnum-to-string-during-rake-dbcreate), it seems lot of people have faced the same error.

so adding a note informing about numeric passwords seems like a good idea
Add quotes to Numeric Passwords to force string(jdbcmysql)

If you have numeric password for your database, like below:
```yaml
development:
  adapter: mysql2
  encoding: utf8
  database: myblog_development
  pool: 5
  username: root
  password: 123456
```


you will get the following obscure error with unhelpful stack-trace

```shell
/home/gaurish/.rvm/gems/ruby-1.9.3-p286-perf/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `connect': can't convert Fixnum into String (TypeError)
        from /home/gaurish/.rvm/gems/ruby-1.9.3-p286-perf/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `initialize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `new'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `mysql2_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:444:in `new_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:454:in `checkout_new_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:425:in `acquire_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:362:in `block in checkout'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `checkout'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:271:in `block in connection'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:270:in `connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:545:in `retrieve_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_handling.rb:79:in `retrieve_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_handling.rb:53:in `connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/railtie.rb:153:in `block in <class:Railtie>'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:30:in `instance_exec'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:30:in `run'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:55:in `block in run_initializers'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:150:in `block in tsort_each'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:219:in `each_strongly_connected_component_from'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:182:in `block in each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:180:in `each'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:180:in `each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:148:in `tsort_each'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:54:in `run_initializers'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:216:in `initialize!'
        from /home/gaurish/code/repo/rails/railties/lib/rails/railtie/configurable.rb:30:in `method_missing'
        from /tmp/numericpass/config/environment.rb:5:in `<top (required)>'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:190:in `require'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:190:in `require_environment!'
        from /home/gaurish/code/repo/rails/railties/lib/rails/commands.rb:70:in `<top (required)>'
        from script/rails:6:in `require'
        from script/rails:6:in `<main>'
```
Looking [Can't convert fixnum to string during rake db:create](http://stackoverflow.com/questions/3765834/cant-convert-fixnum-to-string-during-rake-dbcreate), it seems lot of people have faced the same error.

so adding a note informing about numeric passwords seems like a good idea
Add quotes to Numeric Passwords to force string(sqlserver)

If you have numeric password for your database, like below:
```yaml
development:
  adapter: mysql2
  encoding: utf8
  database: myblog_development
  pool: 5
  username: root
  password: 123456
```


you will get the following obscure error with unhelpful stack-trace

```shell
/home/gaurish/.rvm/gems/ruby-1.9.3-p286-perf/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `connect': can't convert Fixnum into String (TypeError)
        from /home/gaurish/.rvm/gems/ruby-1.9.3-p286-perf/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `initialize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `new'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `mysql2_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:444:in `new_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:454:in `checkout_new_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:425:in `acquire_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:362:in `block in checkout'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `checkout'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:271:in `block in connection'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:270:in `connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:545:in `retrieve_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_handling.rb:79:in `retrieve_connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/connection_handling.rb:53:in `connection'
        from /home/gaurish/code/repo/rails/activerecord/lib/active_record/railtie.rb:153:in `block in <class:Railtie>'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:30:in `instance_exec'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:30:in `run'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:55:in `block in run_initializers'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:150:in `block in tsort_each'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:219:in `each_strongly_connected_component_from'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:182:in `block in each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:180:in `each'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:180:in `each_strongly_connected_component'
        from /home/gaurish/.rvm/rubies/ruby-1.9.3-p286-perf/lib/ruby/1.9.1/tsort.rb:148:in `tsort_each'
        from /home/gaurish/code/repo/rails/railties/lib/rails/initializable.rb:54:in `run_initializers'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:216:in `initialize!'
        from /home/gaurish/code/repo/rails/railties/lib/rails/railtie/configurable.rb:30:in `method_missing'
        from /tmp/numericpass/config/environment.rb:5:in `<top (required)>'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:190:in `require'
        from /home/gaurish/code/repo/rails/railties/lib/rails/application.rb:190:in `require_environment!'
        from /home/gaurish/code/repo/rails/railties/lib/rails/commands.rb:70:in `<top (required)>'
        from script/rails:6:in `require'
        from script/rails:6:in `<main>'
```
Looking [Can't convert fixnum to string during rake db:create](http://stackoverflow.com/questions/3765834/cant-convert-fixnum-to-string-during-rake-dbcreate), it seems lot of people have faced the same error.

so adding a note informing about numeric passwords seems like a good idea
repeating documentation for form helpers
Use `File.expand_path` instead of `File.join`

cc/ @carlosantoniodasilva
Put the reference and belongs_to attributes in the scaffold tests.
Make references and belongs_to attributes to generate the _id column in
fixtures
Deal with polymorphic attributes correctly in the generators
Extract a attributes_names method to avoid duplication
Add GeneratedAttribute#column_name to get the name of the column in the
database
Merge pull request #8472 from schneems/schneems/expand_path

Use `File.expand_path` instead of `File.join`
Ensure the scaffold tests will pass when using references attributes
Merge branch 'scaffold_fixes'