Merge pull request #41 from RaresAmbrus/local/hydro-devel

Adding the ability to run two instances of openni_wrapper on two computers.
Merge pull request #42 from RaresAmbrus/local/hydro-devel

Updated the readme for openni_wrapper
Merge pull request #44 from RaresAmbrus/local/hydro-devel

Using env var STRANDS_HOSTNAME in openni_wrapper