fixes enable_extension bug in postgresql_adapter

The use of quotations is required to install extensions with certain
characters in them (e.g. uuid-ossp).

removes CHANGELOG entry

Deemed unnecessary.
Add `rails test` command to run the test suite

To run the whole test suite:

    $ rails test

To run the test file(s):

    $ rails test test/unit/foo_test.rb [test/unit/bar_test.rb ...]

To run the test suite

    $ rails test [models,helpers,units,controllers,mailers,...]

For more information, see `rails test --help`.

This command will eventually replacing `rake test:*`, and `rake test`
command will actually invoking `rails test` instead.
Update testing documentation

* Update test invocation to use `rails test` instead.
* Update all the test command previews (since we're now using MiniTest.)
* Mentioning MiniTest instead of Test::Unit.
* Update list of test suites.
Add support for MiniTest flags in TestRunner

Any flags that got set will be passed through to MiniTest::Unit.runner,
such as `-n`, `-s-, and `-v`.
Load fixtures only when running suites, or `-f`

* `rails test -f` will run the test suites with all fixtures loaded
* New application will now generated without `fixtures :all` line
  enabled by default.
Improve wording for rails test command
Fix "ActiveRecord" => "Active Record" in changelog [ci skip]
Merge pull request #9618 from manvsmachine/fix-postgres-enable-extension-error

Bugfix for enable_extension in postgresql_adapter.

The use of quotations is required to install extensions with certain
characters in them (e.g. uuid-ossp).
included "Montevideo" in list of time zone aliases (closes Issue #9628)
Uniqueness validation uses a proc to specify the `:conditions` option.

This is a follow up to #5321 and follows the general direction in
AR to make things lazy evaluated.
Merge pull request #9633 from senny/5321_make_it_lazy

Uniqueness validation uses a proc to specify the `:conditions` option.

This is a follow up to #5321 and follows the general direction in
AR to make things lazy evaluated.
Merge pull request #9637 from GSI/master

Include Montevideo time zone in list of aliases. Closes #9628
Change uniq validation with conditions examples to use where with hashes

Take the opportunity to showcase where.not.
Update Rake tasks to call `rails test` instead

Also, print out deprecation warning for other rake tasks except
`rake test` and `rake` (default)
Make sure that `rails test` load test in test env
Make sure that debugger isn't included in production environment.
Merge pull request #9638 from siong1987/debugger

Make sure that debugger isn't included in production environment.
document habtm join-table name with custom prefix [ci skip].

Closes #9643.

The logic was introduced with 46492949
Merge pull request #9645 from senny/9643_habtm_wrong_table_name

document habtm join-table name with custom prefix [ci skip]
Address ActiveRecord::StatementInvalid: OCIError: ORA-00979