Replace external/jhead path to new repository android_external_jhead

Change-Id: I147f5a4673dbffff9d96a7125d8d7bcac17cb6e6
Replace frameworks/ex/ path to new repository android_frameworks_ex

Change-Id: Iec2868861f34fe9530b28e5e518ca6e5ae619832
Merge remote branch 'omni/android-4.4' into android-4.4