Particles Update

Been a while. Quick outline of what I did since last time:

• Added math to base processor so that particles can be drawn or expelled from a central gravity well.
• Finished adding support for custom shaders (no more COMPILING after shader modifications!!)
• Added more attributes and exposed them to shaders. Currently color is calculated based on particle's age and velocity. Size is likewise.
• Figured out how to turn on aliased (circular) GL_POINTS
• Turned on alpha blending

So not too much in all actuality...but it felt like a lot. Bunch'a pictures as well: