Now batches are actually batches.
Also added the MeshFactory class.
Drawing modes are now specified with DrawMode instead of the
GLenum. Renderables must be specified with a draw mode.
Now using GLFW3 instead of the custom window class. This library
looks like it will make development much simpler and will make it
so that I am less worried about my windows code breaking. Currently
setup the http://antongerdelan.net/opengl/hellotriangle.html
tutorial in the MySimpleScene. Will probably create another scene
file to try to get the object oriented stuff working.
