+ cleanup
Merge branch 'backup'

Conflicts:
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	c++/OpenGL/openglbook/build/CMakeFiles/CMakeCXXCompiler.cmake
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	c++/OpenGL/openglbook/build/CMakeFiles/CMakeDirectoryInformation.cmake
	c++/OpenGL/openglbook/build/CMakeFiles/CMakeOutput.log
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	c++/OpenGL/openglbook/build/CMakeFiles/Makefile2
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	c++/OpenGL/openglbook/build/CMakeFiles/cmake.check_cache
	c++/OpenGL/openglbook/build/Makefile
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