Merge pull request #1 from PBS-KIDS/circle-collision

Circle Collision Update
Create README.md
Update README.md
Merge branch 'master' of https://github.com/PBS-KIDS/Platypus
Removed old SoundJS overrides and made the dom-element component a bit more intuitive by allowing key/value pairs to be sent into both the set-style and set-attribute event handlers.
Updated documentation to include start-chasing and stop-chasing calls.
Updated camera documentation to include the "camera-loaded" and "camera-stationary" events.
Todd's addition to allow for more camera buffer flexibility.
Updated documentation to include the camera-loaded and add-tiles events.
Updated documentation for logic-spawner, which replaces logic-bullet. Also changed state to "spawning" rather than "firing" and the trigger is now "spawn" instead of "fire".
Updated documentation for tiled-loader to include level-load syntax.
Added documentation to the level-scrambler component.
Updated logic-rebounder documentation.