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
Merge branch 'develop' of https://github.com/vrsys/guacamole into windows_port

Conflicts:
	cmake/modules/find_compiler.cmake
	src/gua/renderer/CompositePass.cpp
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.
added simple loading screen instead of ugly transparent window
fixed loading screen for stereo pipelines
fixed NURBS not being displayed
reloading materials loads new materials as well
guarc ignores temporary files now
simplified composite pass
fixes in nurbs shading
Merge branch 'develop' of https://github.com/vrsys/guacamole into develop