OBJ Loader

I've choose a OBJ extension to load models from. Its quite simple and popular. In the DX11 there's no more ID3DX10Mesh class, so all the utils thing like loading a mesh from a file gonna be made by hand. I know there's a lot of open libraries etc, but it's always better to write it by yourself for the first time.
So I haven't done much more than the LoadObj() function and some basic classes like Mesh, Material and Model. It's still much to write.