Acid - final release

Optimized quasicrystal code: full window size render ~17 seconds for 30 frames
http://pastebin.com/fjLQnbkB

|0) is used to force JS to convert to int32, it can be ommited from both examples and it will run too.
  xsum*(((xsum>0)<<1)-1)
one multiply one sub one shift one compare. In C code there are faster bithacks to get abs value, like  (x ^ (x >> 31)) - (x >> 31) for ints
but this works for anything and not arch-specific.