Matrix: Changed implementation from 'Vector<T,M> mElements[N]' to 'T mElements[N][M]'. This should make it slightly easier to supply pointer to OpenGL. It's also slightly safer and more standard compliant as we remove the possibility of potential padding between column vectors.
Matrix & Vector: Added convenience getters for OpenGL.
Merge pull request #16 from SkipIfZero/feature/opengl_compatibility

Changed Matrix representation