Refactored targetTime into duration
Added real TargetTime

Handler/Runnable to update UI instead of tick in broadcast
Replaced repeatingAlarm by single wakeup alarm
refactoring: removed PeaceOfMindRun.mPastTime
Removed unused PeaceOfMindPrefs.mLastTimePinged
Fixes #6

Replaced initial broadcast by a wakeup alarm for the end sent to the
broadcast receiver. The UI is updated using a Handler/Runnable. Widget
is updated using a non wakeup alarm through the broadcast receiver.
Added a second lo-res video using H.264 for some devices