Changed license to Apache v2.0
Added license file and fixed library install
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/hydro-devel'
Added install rules for OpenNI2 and updated openni_wrapper to use installed library
Merge pull request #8 from RaresAmbrus/hydro-devel

Set up install rules for openni_wrapper and OpenNI2