Earth model with bump mapping, specular texture and dynamic cloud layer.

Adpated from the THREE.js tutorial: http://learningthreejs.com/blog/2013/09/16/how-to-make-the-earth-in-webgl/
Merge branch 'master' of https://github.com/Shadertool/shaderdb.git
Adpated from the THREE.js tutorial:
http://learningthreejs.com/blog/2013/09/16/how-to-make-the-earth-in-webgl/