Add some AOKP "flare" when flashing

Change-Id: I26cdc70df56fa2a15da46d239703ec8c44c4b7c3
Fix use of Custom releasetool

Change-Id: I33c9d723a29c25789e01c4247fc05f8a917f20f2
Split to multiple bash commands.

This can fix the error "/bin/bash: Argument list too long", if we get a
really long apk list.
Bug tracker Link: http://code.google.com/p/android/issues/detail?id=38937

Change-Id: I72258125c4297dfd9f8f502a96dbfa5a08f3cc50