working for circletest except for bullets sometimes skip over an element
circletest working with global physics timer
added while loop to reaction to ensure all collisions resolved each timestep, moved Collisions.list.push to element con constructor, and  circletest and polygontest working but not dronewar (yet)
dronewar working with latest code, moved some things around and added @destroyed property to @element class as well as some other new methods
renamed on to start, off to stop, start to start_physics, stop to stop_physics, activate to start_collision, deactivate to stop_collision, dronewar working, circletest working, rectangle collisions on polygontest not working
fixed polygontest bug by fixing while loop conditional and increasing max iter to 32 in elastic_collision, also made fang stronger in dronewar by increasing firing rate and bullet speed
recompiled dronewar and renamed a couple of variables for clarity e.g. dot1 = dot_a and dot2 = dot_b in reaction.coffee etc.