MeshBuilder: addSphere(...) allows customized spheres.
added OpenCL bindings
added OpenCL bindings and tests
restructuring of the OpenCL API
added helper context
removed HelperContext again because it was stupid
forgot to remove HelperContext.cpp from CMakeLists.txt
implemented image buffers
finished opencl api
Merge branch 'opencl' of github.com:MeisterYeti/Rendering into opencl