Make libart the default runtime

Change-Id: I7ccc0aefef040c2c4ba7ed6546a7294ec8dd3c63
Signed-off-by: Rob Beane <robbeane@gmail.com>
build: Set ccache base to build top

This enables ccache sharing between different build tree paths.

Change-Id: I99636bdd2779a6ccf0649f027e35cf67df44b6ae
Signed-off-by: Rob Beane <robbeane@gmail.com>
Don't set CCACHE_BASEDIR if its already set

 * enable use of shared ccache

Change-Id: Ic708a5d5169291d674b167aa2c87bf2c8adaafae
Signed-off-by: Rob Beane <robbeane@gmail.com>
build: Add remote commands to envsetup

Signed-off-by: Rob Beane <robbeane@gmail.com>
releasetools: Disable downgrade check

We want users to be able to downgrade their packages.

Change-Id: I6bcbd4ee2a02640fe0855b0f1f197a02e914c927
Signed-off-by: Rob Beane <robbeane@gmail.com>