Halo: Modify behavior

Don't ping when halo got "silent" notifications.

Change-Id: I54d16d8aefbf173e6edcdf4f2fc3e6cbf6f55420
Halo: Some Tweaks

Do not launch floating window when on default launcher
Do not launch in floating mode if notification is from the foreground app

Change-Id: I6eb2ff093dbc395bc2fb76176c42276f6bd4165b
Merge changes I6eb2ff09,I54d16d8a into kitkat3

* changes:
  Halo: Some Tweaks
  Halo: Modify behavior