link to particle engine example on main page, index-offline, and animate page example list. link to socket example in index-offline.
triggers explanation and example
removed internal use section
restructuring
overview
reorganization
cartesian
property types for all particle engine options
defaults
polar
minor cleanup
methods: obtainParticleArray; emitParticles; runTick.
Merge pull request #177 from gameclosure/feature-particle-engine

link to particle engine example on main page, index-offline, and animate...