Fix to compile with 10.8 SDK.
Remove obsolete comment.
Ensure all nibs are written in IB 3.2-compatible format (written with Xcode 4.6.3).
NSUserNotification alert (10.8+).

Still compiling with the 10.6 SDK, so we need to include the header.

Unlike Growl, we can't control whether or not the alert is sticky, so we don't use it to display the alarm preview.
Remove InfoPlist.strings in the project file too.  It isn't necessary.
Cleanup.
PesterLogAlarmTimerExpired default to log expired alarms (not exposed in UI).

Suggested by Mikey Reppy (@mgreppy): https://twitter.com/mgpreppy/status/361353544714039296