CM11 Themes: Pipe stderr from aapt to logcat.

This will allow users to see why aapt failed when installing a
theme.

Change-Id: I74314daae9e844dce2f4c3eeb6c78a40b5ad6357
(cherry picked from commit ccb5cd94efde6c1bbe8f5e24288ccc1f816d361b)