Added Dropbox authentication for iOS app
Added basic viewing of list of notes in iOS.
Added missing piece of code that allowed for auth
In Dropbox, with Tony.
Added some tests until ViewNote branch can be merged.
Merged branch 'master' into master_viewnote

Conflicts:
	_Note iOS App/_Note.xcodeproj/project.xcworkspace/xcuserdata/duongnguyen.xcuserdatad/UserInterfaceState.xcuserstate
	_Note iOS App/_Note.xcodeproj/xcuserdata/duongnguyen.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist
	_Note iOS App/_Note/AppDelegate.m
	_Note iOS App/_Note/Base.lproj/Main.storyboard
	_Note iOS App/_Note/NoteEditorViewController.m
	server/server_tests.py