Utils: Add GitHub forking tool

Change-Id: Ida89d9e331ccdcbf627195f33c17129d383c87e2
utils: Update AOSP forking script

Change-Id: Ifbb68a5940c079b8b0898e6a7d66df92d9077c28
Merge "Utils: Add GitHub forking tool" into android-4.4
Merge "utils: Update AOSP forking script" into android-4.4
Merge remote-tracking branch 'omni/android-4.4' into android-4.4