Made a rough sketh of the Login View

Added LoginUserSelectionCell for login icons
Set up Login View to display users from db
Added Login Prompt to Login Screen
Merge branch 'development' into merchleg-login
Changed Deployment Target to iOS 6.0
Completed Functionality of Login Screen

When logged in the shared UserDatabaseManager has a
reference to the user that was logged in. It can be
accessed by:
[[[UserDatabaseManager] sharedInstance] currentUser]
Merge branch 'development' of github.com:cdegit/cmpt275-group9 into local development