Ripped out CoreData code and replaced with Parse

This is non-functional!
Fixed lots of bugs with Parse support
Fixed a saving bug
Fixed a bug presenting the table view
Fixes #12 where calendar would not get updated
Fixes issue #11
Added Twitter sign in
Disabled Local Datastore because of weird swift bug
Only pulls the current user's reminders
Added an "isPublic" property for Reminder
Created a dummy User Profile page
Implemented logging out
Refreshes local push notifications when reminders are refreshed
Trivial change
Merge branch 'ParseSupport'