[ADDED] OS X: Lots of warning checks when compiling.
[ADDED] OS X: Ability to enable and disable iCloud.
[ADDED] OS X: Support for rememberKey & saveKey.
[UPDATED] storeKey -> saveKey: makes more sense to people.
[IMPROVED] OS X: Password display window fancier.
[MOVED] Key logic now in a common class extension on MPAppDelegate
so it can be shared between iOS and OS X apps.
[MOVED] MPConfig for sharing between iOS and OS X apps.
[CHANGED] keyphrase -> key.
[FIXED] Switching between guide and unlock screen.
[ADDED] Sign out button in action so you can sign in with a
different master password.
[REMOVED] Change password from MPConfig. There are better facilities
for this now.
[FIXED] Image names in the lockscreen.
