sphere/box contact bugfix; thanks to @trevex
Serialization fixes: Vec3.tangents() and Particle sleep. Thanks to @airbaggins
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