Halo: Ping on unlock changes

 * Stop message flip animation on unlock
 * Prevent ping spam on unlock -
    - Ping ONLY if NEW notification received while device is locked/screen is off
      (If a notification pinged HALO once but was ignored, it will not ping again unless updated)

Signed-off-by: Dan Trifan <jimsth@gmail.com>

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/halo/Halo.java

Change-Id: I20d764d7122819ae66c45ee21d8678a36a8e03dc
Merge "Halo: Ping on unlock changes" into jb43