AwesomeAction Background thread and kill app changes

launchAction can be handled off the UI thread.
kill app should remove the task from recents too.

Change-Id: I9c24a68667a859fae7df1a71a18e30cc66ff69a5
Merge "AwesomeAction Background thread and kill app changes" into kitkat
Merge branch 'kitkat' of github.com:AOKP/frameworks_base into kitkat