Openni 2.2 drivers

This pull request integrates the openni 2.2 drivers in scitos robot. For now I've kept the binaries as well, just in case they will be needed, but they are not used; instead I've linked the project to the Openni2.2 git repository. 
When checking this project out you will have to run (in the root of the project):
`git submodule init`
`git submodule update`
This will download the Openni 2.2 repository, which will be compiled along with the rest of the project (note that compilation will take some time, about 2-3 minutes, but this only needs to be done once).