Moved kinect to github, moved freenect to drivers, build freenect only on ubuntu

Not sure for the Version checking how this should be done currently.
The current realization is working but seems a bit ugly.
Just had a talk to malgosia, we curentl don't know exactly if all kinects are spported by the current osdeps for debian/ubuntu.

I could add a osepd for debian/ubuntu, currently it seems to work with the kinect versions we have.
Is there a way for the end-user to switch back by a override from the osdep to the packages version?
If so i would like to activate the osdep, otherwise i would like to stick to this packaged version for a few additionals months.