Merge pull request #24 from DelvarWorld/linty

Fixing jshint errors again
Removed old uniforms from shader code. Removed pointless vec4 pos assignment in vertex shader.
Moved basic example back to using smokeparticle texture.
Introduces angularVelocity/spread for spinning particles

Addresses issue #16. Take two, this time off of dev taking into account
stemkoski's changes.

Updates readme to include angleAlignVelocity