Add angular-devise to bower
BlogController to HomeController in Rails, Auth service, Auth module and routing
RSpec test for associations in Post/User, fixes old tests
Simple signin with redirect
Bug with incorrect header welcome message after logging
Logout
Hide header on sign in page
Merge branch 'feature/authentication' into develop

* feature/authentication:
  Hide header on sign in page
  Logout
  Bug with incorrect header welcome message after logging
  Simple signin with redirect
  RSpec test for associations in Post/User, fixes old tests
  BlogController to HomeController in Rails, Auth service, Auth module and routing
  Add angular-devise to bower