Implements error checking for facebook login attempt
Encapsulates login process into api
Implements facebook logout
Adds user update call for LoginViewController
Adds commenting to User update
Removes commented out code
Fixes unwanted interaction with table view when picker is up
Year picker selects current year when picking year in change semester popover picker
Begins debugging ChangeSemester bug when app quits
Uses modalNav property to present the change semesters controller