minor code revisions and update readme
updated asteroids index to fit screen
minor refactors
added some laser supporting code, updated randomPosition
changed some numbers and moved some code around
added vertices for lasers
added messages fade out
more laser code
lasers rendering
Giant laser powerup working
fixed laser flashing
moved css to style tag
refactored some code
changed ship and shield blinking
added game restarting
fixed random positions to not be near ship