Updating CMakeLists.txt to have debug and release builds
Adding some actual code.

Doesn't actually draw anything yet, but have added a few structs and
started a maths library to manipulate vectors and matrices.

Vertex: Hold position, colour, texture coords, and normal of a vertex
Mesh: Holds mesh data (Array of vertices and indices)
DrawableObject: All the GL guff and mayb ea texture.

Also wrote something to initialise a sphere (So we can draw planets
    evertually).

To do next: Extend math library - write perspective projection.
Merge branch 'master' of github.com:andrewrchambers/orrery

Conflicts:
	CMakeLists.txt