collisions!
added ship death, break apart asteroids

plus FPS readout
executing moves with a delta
changed the asteroid's scale and division factor

3 levels instead of 4
fixed bullets
reimplemented using canvas alone

crazy fast!
moved stuff around
added explosions and the reap flag
fix border bug
push the roids out a bit when fragmenting
moved framerate inside canvas
doing things a little more OO
added grid, grid display, play/pause, die()
using grid to limit collision calculations
fixed short lived bullet bug
now using isPointInPath
added collidesWith to the objects
now we have a font
make the framerate less jittery
added game states, start/spawn, pause display