ref #77 Add empty shader for pathtracing testing.
ref #77 attached vertices, normals and (empty) geometry data to shader as buffer texture.

Data format seems to be wrong. Maybe we have to copy the data to a vec4 array? http://www.opengl.org/wiki/Buffer_Texture#Image_formats
ref #77 Texture Buffers working.

Shader can access vertex, normal data and (still empty) geometry array.
Test shader searches the nearest vertex for each fragment and uses its normal as color.
Merge remote-tracking branch 'origin/master' into PathTracingGPU_77

Conflicts:
	apps/cgsee/painter.cpp
ref #77 Attach index buffer to PathTracing shader
ref #77 Camera: Define uniform name constants as class consts
ref #77 Add class PathTracer as path tracing "camera"

Path tracing fragment shaders need to be called on each pixel of the view port, not on all possibly visible fragment of the geometry.
Added stub for buildBoundingVolumeHierarchy #77.
Merge remote-tracking branch 'origin/master' into PathTracingGPU_77
createt abstract interface CoordinateProvider
created abstract interface CoordinateProvider
Merge branch 'picking_and_highlighting' of github.com:cgcostume/cgsee into picking_and_highlighting
merged master into picking_and_highlighting
added dockwidget for scenehierarchy
implementing StereoCameras #76

not working yet, problems with const program in convergentCamera.cpp
minor changes

add update()!!
again minor changes

(fix) correct eye position
implementing first version of convergentStereoCam

startet parallelStereocameras
correct convergent, implementing parallel
#77 testing shader for texture buffers in path tracing.