Torch: refactoring

Fixed some Android Lint warnings.
Removed unused strings and imports.
PS2: added AndroidManifest.xml, forgot to copy it.
PS3: buildbot doesn't seem to like empty "text" attribute, removed it.
PS4: rebased.

Change-Id: Ibcb7aa0f38a5433795dcd822ce49b90fb1f315d6
Merge remote-tracking branch 'cm/cm-10.2' into cm-10.2