Merge pull request #1 from PouyaAdn/master

Implemented Particle.zRotation()
0.1.0-beta.6
Split the frag shader using black-sugar
Particles can now simulate motion blur
Implemented ImageRepo to streamline managing images
Removed a bunch of the old elements
Got the basics for adding post-processing layers
Added YattaGL.Rectangle
post-processing baby!
Added negative and glow post-processing effects
Box Blur Effect Added