experimental repo changes in the master branch

Hi,

There is a an experimental feature of groups added in manifest by JBQ to reduce the downloads when we clone . The details are here: https://groups.google.com/forum/#%21msg/android-building/Zf1oirfV_v0/1VSGkFi...

The current issue is repo manifest -r -o seems to be broken with this new group feature due to which I am not able to build AOSP galaxy nexus master build: https://android-build.linaro.org/builds/~vishalbhoj/nexus-asop/

Fow now I will work out of android build from the branch android-4.1.1_r6 .

On the other note, this feature should allow us to download kernel and u-boot selectively depending on the target which can allow us to get to a single manifest . I guess we should put invest some time in it.

Regards, Vishal