[FIXED] Schedule all UI-changing methods on the main thread. Fixes
some UI bugs.
[FIXED] Attempt to calculate password for deleted element.
[FIXED] MP-6: Close open alert when switching sites.
[FIXED] MP-7: Remind user to change site's password when creating a
new site.
[ADDED] OS X: Master password input and changing.
[ADDED] OS X: Autocompletion by searching Core Data for previously
used sites.
[ADDED] OS X: Working password generation for sites.
[FIXED] Bad ciphering on little endian machines: Convert bytes to
network endian before using them as numbers.
[FIXED] Opening of Core Data store when iCloud is unavailable.
[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.
