Use standard initialization procedure in the Qt wrapper.
Small addition to the README.
Moved shader and program load code into the corresponding classes.
Fix for gl_error.h.
Made constructors for GL::Program and GL::Shader protected.
Completed migration to C++11.
Imported stb_image 1.33.
Renamed stb_image.c => stb_image.cpp; Added stb_image.h.
Fix compiler warnings in stb_image.cpp.
Added missing NULL-pointer checks in stb_image.cpp.
Use custom assertion check in stb_image.cpp.
Fix compiler warnings in stb_image.cpp.