Fixed ShaderStage and added Shader (program).
Instances of Eq and Show for ShaderStage and Shader.
Texture!
Added Renderbuffer and Framebuffer (not complete though).
Added attachTexture to attach a texture to a fucking framebuffer.
Added attachRenderbuffer to attach a schiesse renderbuffer of hell to a framebuffer!
Added renderbufferStorage to damned renderbuffers (fuck that useless shit seriously :D)