Small change.

Adds a density, friction and restitution paramter to the boxWorld.addObjects() method, which allows
for some more control over the box2D model.  These parameters set the (you guessed it) density, friction
and restitution of the object that you want to create.

(4/16/14)
Merge pull request #33 from galaxykate/jpagnutt-b2dAddObject

Small enhancement to the boxWorld.addObject() method
Handles refresh their parent chassis onDrag
(4/23/14)
Added a refresh() stub method to attachment.js
Merge pull request #34 from galaxykate/chassis_onChange

Handles refresh their parent chassis onDrag
Handle stuff
Merge branch 'master' of https://github.com/galaxykate/BotPrintEvolved into galaxykate-cleanCode
Make a bot card, add the dna visualization for the bot, and add mutation buttons
turn off the trace controls
Make reversible setFromDNA setDNAFrom
Merge branch 'galaxykate-dna'
Merge remote-tracking branch 'origin/master' into EditMenuDev2