Update ruby version to 2.1.2
Remove ruby version from Gemfile
Merge branch 'develop' of github.com:aliismayilov/edu-rails into develop
Scaffold Category model
Category#order default value is 1
Category#parent
Add better_errors and binding_of_caller gems
Show Category#parent
Add category seeds
Category#to_param slug
Scaffold Post model
Post validations
Make pg gem global
Seed Posts
Style Posts#show
Add public files and organize assets initializer
Categories#show style
Categories#show posts pagination
Remove Home#index
Posts#index as root