Merge pull request #1 from jkammerl/debian-master

fixing pkg-config configuration
Dont install SimpleViewer binary as a sample.
Install ini files into /etc/openni2/
Also load OpenNi.ini from /etc/openni2
Install and clean html doxygen docs as part of openni2 package.
Merged https://github.com/hcw70/OpenNI2/pull/5 Pull request
Add missing libjpeg-dev dependency