Remove posts and comments

Posts and Comments removed from the app core.
Examples will be moved to the `example` branch.
Merge branch 'master' into remove-examples

* master:
  Update rails_best_practices options
  Move rubocop configuration to config/rubocop.yml
  Add brakeman configuration
  %w-literals should be delimited by ( and )
  Use nested module/class definitions instead of compact style.
  Prefer before_action over before_filter
  Prefer skip_before_action over skip_before_filter
  AllCops/Excludes was renamed to AllCops/Exclude
  Update rubocop to 0.20.1
  Update brakeman to 2.4.3
  Update ruby to 2.1.1

Conflicts:
	app/controllers/user/base_controller.rb
	app/controllers/user/comments_controller.rb
Merge branch 'master' into remove-examples

* master:
  Do not mention patch level for ruby
Merge pull request #59 from fs/remove-examples

Remove posts and comments