Updates codesigning identity
Begins reimplementing Change Semester Controller
Implements presentation of child view controllers
Adds title of segmented control options
Adds navigation items to change semester controller
Removes pendingChanges method from protocol
Sets up logic to request semester from user
Lays out views for ipad and iphone
Adds table view
Finishes implementing add semester controller
Fixes bug with add semester view controller and begins implementing remove semester view controller
Implements remove semester controller