make the definition of external/box2d as an override more robust

The osdep overrides are only used when necessary, so this all
lets-explicitly-check-for-OS-version-and-name stuff is really
not needed, as already explained in #2
define drivers/orogen/kinect unconditionally

Autoproj will automatically exclude it on architectures where
drivers/freenect won't be available. This commit also makes sure that
the (idiotic) freenect versioning requirements are showing up in
the osdeps
fixed libprocps3-dev for ubuntu 14.10
make the newest lib version default, which hopefully also handles future ubuntu versions
Merge pull request #16 from rock-core/fix_pr2

Fix PR #2
Merge pull request #20 from planthaber/14.10

fixed libprocps3-dev for ubuntu 14.10
moved freenect to drivers and kinect to github