Merge pull request #1 from vrsys/develop

Develop
restrict to master branch
Merge branch 'develop'
fixed bug in find_compiler.cmake
and find_boost.cmake
Added Volume.h
Added VolumeLoader.h

Integrated laoding of Volumes
Integrated managing of VolumeNodes
Integraded compositing of Volumes in CompositePass.cpp
texture upload_to() change from protected to public
Cleanup Volume Rendering Code in compose.frag
added test printing
Merge branch 'develop' into feature/screen_geometry_child_fix
fixed bug in serializer which made it impossible to see geometry attached to a screen
added RayNode to dll-interface
removed cuda from dependencies
Merge branch 'develop' of https://github.com/vrsys/guacamole into develop
Fix bug in setting of BOOST_LIBRARIES.
Merge branch 'develop' of https://github.com/vrsys/guacamole into windows_port

Conflicts:
	cmake/modules/find_compiler.cmake
	src/gua/renderer/CompositePass.cpp
added external-folder as search dir for schism
changed default search path for OVR
Merge pull request #12 from scholli/develop

added external-folder as search dir for schism
Merge branch 'develop' of https://github.com/vrsys/guacamole into windows_port
PostFXPass used only pipeline::shading gbuffers, change to pipeline::compositing,

TODO: Use pipeline::shading gbuffers only and read write in to this gbuffers using them in pipeline::compositing
Remove whitespaces.
Change to shading.