3 lights ( + material and shader injection) implemented and tested on ios, android and rasberrypi

Lot of changes. Please review
+1 on name clarity

On Tue, Dec 16, 2014 at 3:34 PM, Matt Blair <notifications@github.com>
wrote:
>
> In core/resources/polygon.vs
> <https://github.com/tangrams/tangram-es/pull/31#discussion-diff-21929857>:
>
> >  varying vec4 v_color;
> > +varying vec3 v_ecPosition;
>
> Would it make sense to call v_ecPosition v_eyeToPoint or something like
> that? It took me a while to figure out what that variable was
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/tangrams/tangram-es/pull/31/files#r21929857>.
>