Fixed a bunch of OS X issues.

[FIXED]     Don't create a moc when the main moc is unset.
[FIXED]     Load the MPUserEntity into the moc when doing selectUser:
[FIXED]     Remove KVO on activeUserObjectID, isn't used anymore.  Instead, override setActiveUser:
[FIXED]     Don't show the password window on launch.
[FIXED]     Don't force unlock of the key whenever unset - only when the window pops.
[REMOVED]   Migration - this app is not ready for explicit migration, additionally, this block appears to cause a lock-up of the PSC.
Password window style.

[ADDED]     Ability to change style of password window.
[FIXED]     Some window activation oddities (WIP).
[UPDATED]   Renamed executable iOS/Mac specific in the hopes of helping with IDE conflicts.