Add NetHack sprites.  It'll be sweet to have better graphics.

Thanks NetHack!!!  Loved you in NetHack!
Quick commit.  This is messy, I know.
Update to Crafty v0.6.2.

* Update Crafty source.
* Replace GAME.turnDuration to match new Tween() definition.

Signed-off-by: suicidepills <atom.mac@gmail.com>