add `-m` flag to git commit for section I5.

without the `-m` flag an error will be displayed. This is the same error that was in [my previous pull request](https://github.com/JumpstartLab/curriculum/pull/644) but in a different section of the tutorial.
Create section to add destroy action to `tags_controller.rb`.

Toward the end of section I5 where we are sprinkling `if logged_in?`'s there is a line that says: 

    Similarly, hide the ‘delete’ link for the tags index.

But in section "I3: Tagging" we never created the `delete` link.
Add note section that unicorn will not work on windows.

Unicorn is not supported on Windows and I didn't want anybody going down a rabbit hole trying to get it to work.
Merge pull request #648 from oblakeerickson/patch-7

Add note section that unicorn will not work on windows.
Add note section for removing line that won't work in Rails 4

With the `attr_accessible` line in it gives this error:

    $ bundle exec rspec
       c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activemodel-4.0.0/lib/activ
e_model/deprecated_mass_assignment_security.rb:14:in `attr_accessible': `attr_ac
cessible` is extracted out of Rails into a gem. Please use new recommended prote
ction model for params(strong_parameters) or add `protected_attributes` to your
Gemfile to use old one. (RuntimeError)
        from c:/Users/blake/code/contact_manager_2/app/models/person.rb:2:in `<c
lass:Person>'
        from c:/Users/blake/code/contact_manager_2/app/models/person.rb:1:in `<t
op (required)>'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/dependencies.rb:228:in `require'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/dependencies.rb:228:in `block in require'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/dependencies.rb:213:in `load_dependency'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/dependencies.rb:228:in `require'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/dependencies.rb:329:in `require_or_load'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/dependencies.rb:462:in `load_missing_constant'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/dependencies.rb:183:in `const_missing'
        from c:/Users/blake/code/contact_manager_2/spec/models/person_spec.rb:3:
in `<top (required)>'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/dependencies.rb:222:in `load'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/dependencies.rb:222:in `block in load'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/dependencies.rb:213:in `load_dependency'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/dependencies.rb:222:in `load'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rspec-core-2.1
4.5/lib/rspec/core/configuration.rb:896:in `block in load_spec_files'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rspec-core-2.1
4.5/lib/rspec/core/configuration.rb:896:in `each'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rspec-core-2.1
4.5/lib/rspec/core/configuration.rb:896:in `load_spec_files'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rspec-core-2.1
4.5/lib/rspec/core/command_line.rb:22:in `run'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rspec-core-2.1
4.5/lib/rspec/core/runner.rb:80:in `run'
        from c:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rspec-core-2.1
4.5/lib/rspec/core/runner.rb:17:in `block in autorun'

I believe the attr_accessible stuff is taken care of in the controller in Rails 4 so we might need to also update the controller to account for this.

Not sure if you want these Rails 4 specific changes in this tutorial or not?
Modify the 2nd occurrence of the first test so that it matches the 1st occurrence.

Up further above in the tutorial where we wrote this test for the first time it is correct. In this section of the tutorial it got changed to 'to_not'.
Merge pull request #651 from oblakeerickson/patch-9

Modify the 2nd occurrence of the first test so that it matches the 1st o...
Merge pull request #650 from oblakeerickson/patch-8

Add note section for removing line that won't work in Rails 4
Merge pull request #646 from oblakeerickson/patch-5

add `-m` flag to git commit for section I5.
Removed all numbers for evaluation
Merge pull request #652 from JumpstartLab/evaluation-removed-numbers

Removed all numbers for evaluation
Moving building identity over from the outline
Merge branch 'master' of github.com:JumpstartLab/curriculum
Removing remaining references to rubric and points in major projects
Merge branch 'master' of github.com:JumpstartLab/curriculum
Fuck frontmatter
wrapped lines to 80 col
Merge pull request #647 from oblakeerickson/patch-6

Create section to add destroy action to `tags_controller.rb`.
Update environment tutorial for Mac OS X
Updated building identity to provide links to the heroku toolbelt