Add $.post request when user adds artist to favorites

- JS will redraw view and send artist object to server
- Server will store in database
Merge branch 'master' of https://github.com/spring-peepers-2014/Giggidy into authentication
Add devise authentication gem

Remove bcrypt gem
Bcrypt is a dependency of devise
Transition to devise for guest user support
Merge branch 'master' of https://github.com/spring-peepers-2014/Giggidy into authentication
Merge branch 'master' of https://github.com/spring-peepers-2014/Giggidy into authentication

Fix merge conflict by removing whitespace

Conflicts:
	giggidy/app/assets/javascripts/application_controller.js
Merge branch 'master' of https://github.com/spring-peepers-2014/Giggidy into authentication
Re-enable bycrypt

Implement simple user authentication
Add guest boolean to users table

guests user will have true value
verified users will have false value
Remove presence validation for guest user
Merge pull request #146 from spring-peepers-2014/authentication

Implement guest users