Allow viewers to add comments
Update existing specs to use new flash class
Add ability for viewers to edit their comments
Ensure we only see comments for a particular post on that post
Allow comments to be deleted
Add and edit comments
Add ability to delete comments.
View comments on posts page.
Remove equal sign to prevent the raw objects from being displayed
Root to posts#index
Merge branch 'ben-complete_week_three'

Conflicts:
	app/controllers/comments_controller.rb
	app/models/comment.rb
	app/views/comments/edit.html.erb
	app/views/comments/new.html.erb
	app/views/comments/show.html.erb
	app/views/posts/show.html.erb
	config/routes.rb
	db/schema.rb
	spec/factories/comment_factory.rb
	spec/features/deleting_a_comment_spec.rb
	spec/features/viewing_comments_spec.rb