Fix for sleeping objects never waking up. Refactored Particle methods into prototypes
Fix for boundingSphereRadius not being a method - added method to get/recalculate bounding sphere radius and store it as necessary
Fix for RigidBody not inheriting Particle properly
Fixed order of build
Updated builds
Merge branch 'dev' of https://github.com/schteppe/cannon.js into dev

Conflicts:
	build/cannon.js
	build/cannon.min.js
	src/objects/Particle.js
Merge pull request #51 from airbaggins/dev

Particle inheritance, rays/bounding-spheres, sleeping objects dying