Texture binding + creation

Closes #49
Funny, rust even complains if we access vecs the old way now.

> On Jul 19, 2014, at 16:30, Brendan Zabarauskas <notifications@github.com> wrote:
> 
> In src/render/envir.rs:
> 
> > @@ -171,7 +171,7 @@ impl BindableStorage for Storage {
> >                  Some(p) => p,
> >                  None => return Err(ErrorUniformNotFound(uniform_var.name.as_slice()))
> >              };
> > -            match uniform_var.is_compatible(self.uniforms.get(pos).ref1()) {
> > +            match uniform_var.is_compatible(self.uniforms[pos].ref1()) {
> Can we index Vecs now?! 
> 
> —
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