Frameworks: speed up statubar/notification drawer

a lot user complain about slow statusbar pull down introduced
with jb 4.2....this speed it up

thanks to IceColdJelly

Change-Id: Iae108f5680b25ea995168a505a30e06bef0185d3
Fix little derp causing visual bug
To reproduce, disable halo, and press "clear all notifications" button

Change-Id: Ice7ab62229e27db53ef51fd5df55dbcd0a86358b
- Jesus David

Give floating flag to previous activities in the stack
When launching stacked activities, only the last one is flagged as floating in
 sysui when tapping halo.
This causes the system to show the launcher when the first stacked activity is
launched (this first intent gets the flag FLAG_ACTIVITY_TASK_ON_HOME
in TaskStackBuilder).
This change makes all the stacked activities get the floating flag if the last
 one has it.
-beerbong
Merge pull request #12 from pcarenza/jb-mr1

A couple of halo fixes