Added a Particle Example

Added a new directory, examples, and particles. Examples will be
uploaded and focused on specific tasks.

index.html
An updated index.html based off of the master, shows how to use SpiceJS
with a simple particle system implementation.

particles.js
I've thought about including particles in SpiceJS, however at this time
particles.js is just a custom built particle factory designed to run in
a typical game loop fashion and thus prepped for SpiceJS.