Fix position input for fragment shader
Add minimal doxygen support. Still need to change comments in code for further support. Generating documentation is not integrated when building with CMake yet.
Add html directory to gitignore for managing gh-pages branch from within code branches
Stop ignoring html directory and put doxygen output in docs/
Merge branch 'master' of github.com:danielunderwood/glfw-game-engine into doxygen-integration