Add sun position automatic uniform.
Start adding sun rendering.
first take on extent rotation
replace quaternion rotate with matrix rotate
relocated declaration of rotation matrix
Merge branch 'master' into sun

Conflicts:
	Source/Scene/SceneTransitioner.js
Frustum cull the sun.
Add fragment shader for pretty lame looking sun.
Update sun fragment shader.
Draw sun after the sky atmosphere.
Merge branch 'master' into sun
Merge branch 'master' into rotateExtent
rotate positions before triangulation
Merge branch 'master' into rotateExtent
Merge branch 'master' into sun
Re-add sun bloom without post-processing framework.
Remove unused code and minor tweaks.
Remove hacked bloom and add it to the scene as a post process when the sun is visible.
Rename downScale -> downSample.
Start scissoring out the sun by enabling the scissor test on the down sampled passes.