Add footer, handle non-logged in user viewing post
- Move About link to footer
- Add Static Pages controller + route for About page
- Fix bug where not logged in user
- Change application.css to Sass for variable-making happiness
- Fix Post factory to not have user ID hard coded
- Rename changed class names / content in integration tests
- Add test for guest user look at post content
- TO FIX: vote counts are now hidden on non-logged in user view