Merge pull request #41 from philipqnguyen/authorization

Authorization
Add comment tests
Link comments to articles via nested resources
Refactor Policies
Comments working fine
Twitter sign in
fix rubocop's crap
Update Readme
Only signed in with twitter users can comment
Fix rubocop crap
secret.yml changes
Merge pull request #45 from philipqnguyen/oauth

Oauth
Revert "Update readme"

This reverts commit 2ba5a1a3dc98716373fc5c35941a6b4dbd979906.
remove double assertions