Upgrade to Android 4.1 JellyBean

JBQ released JB:

From: https://groups.google.com/forum/#!topic/android-building/XBYeD-bhk1o

We're releasing Android 4.1 in AOSP today.

The name of the tagged release is android-4.1.1_r1.

The name of the development branch is jb-dev.

We recommend that you create new clients, even if you're working in
the master branch. It'll make your clients smaller and faster to sync.

Proprietary binaries are available for Nexus 7 and Galaxy Nexus. Nexus
S and Xoom will follow.

JBQ, on behalf of the entire Android team at Google.