Merge pull request #1 from RaresAmbrus/master

Adding openni_wrapper with history and OpenNI2 submodule to separate repository
changed URL from git:// to https://
Merge pull request #2 from kunzel/hydro-devel

changed URL from git:// to https://
Merge pull request #5 from RaresAmbrus/master

Fixed some dependencies and maintainer email
Changed license to Apache v2.0
Merge pull request #6 from strands-project/master

I'll merge this now as it seems to be all good.
Added license file and fixed library install
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/hydro-devel'