Support API LEVEL 13, 14, 16 and 17

Change-Id: I5090f5ba6e740d598a97847d4c522d1cddaf0dd6

Conflicts:
	build/core/add-application.mk
Strip target binaries to save size.

Change-Id: Ib83f32f547b30f120a1908866c98f63c4ff05575
Set values in Application.mk explicitly.

This is helpful for users who do 'ndk-build' & 'ant release' manually.

Change-Id: I7131a0808b0a5c96d9073fb79f635f7ee7441b30