Build system updated to use API 19
Revert "stub out proximity lock"

This reverts commit 89d790eecb68d64fbc248f67d2f38c31f16bba1d.

Hopefully, this should get the proximity sensor up and running once
again.
Stub unused class TargetDrawable.DrawableWithAlpha
Disabled Lint verification for release

Temporary fix to get rid of all the crappy error messages, like
incomplete translation, layout issues, etc.