Merge pull request #1 from MasDennis/master

Merged STL Parser
Merge pull request #383 from AndrewJo/master

BlurFilter added
Merge pull request #399 from AndrewJo/master

Support for different cull modes
Merge pull request #400 from AndrewJo/master

Fixed polygon facet bug for front-face culling mode
Added DirectionalLight support

The Bumpmap materials lacked support for directional lights.
Implemented usage of uLightColor

This conforms with previous changes to Phong and Diffuse, but color is
calculated per-vertex where possible.
Merge pull request #425 from Davhed/bumpmap-materials-fix

Bumpmap materials fix
Merge pull request #421 from Davhed/gouraud-light-color

Gouraud light color
Merge branch 'master' of https://github.com/MasDennis/Rajawali