Merge branch 'release/v2.9.0' into develop
added background texture modes
derive NetMatrixTransform from Transform and distribute viewing setup in simpleexample
added global clipping plane option
forwarded update_cache
fixed bug in bounding box wrapping
implemented LODNode
wrapped TUIO protocol into avango deamon for supporting touch
added touch example
wrapped normalize position and normalize scale
fixed bug in TUIOInput and updated touch example
Merge branch 'feature/TUIO_support' into develop
Merge branch 'develop' of github.com:vrsys/avango into develop
Remove symbolic link.
Merge branch 'master' into develop
Apply pylint suggestions.
Move include(find_zmq) to the other includes.
Add search script for OpenAL.
Add CMakeLists.txt for avango-openal.
Remove duplicated code.

DRY.