Fix include path search for openni.
Merge pull request #13 from manctl/nburrus-master

Extract deps into a separate submodule.
Merge remote-tracking branch 'manctl/manctl'
Restore rgbdemo build system.
Update deps.
Fix tipo.
Do not compile samples that require openni when not enabled.
Fix cmake default values.
Do not compile samples that require openni when not enabled.

Conflicts:

	samples/CMakeLists.txt
Merge changes from manctl.
lz4 export was missing.
Change default min/max depth for softkinetic grabber.
Fix compilation when NITE is not installed.
Change the default verbosity level to warn.
Add missing NITE include path.
Fix column/row issue.
Fix distortion matrices column/row access.
Fix freenect support.
CMake: support GLEW from system libraries
CMake: allow userdefined default for use of embedded GLEW + eigen