Replace pick button with mushroom

Addresses #20.
Replaces the pick button with a home made mushroom!
Add artwork for phantom hand

Addresses #20.
Adds some neat pixel artwork for the phantom hand picker.
Center picker

Addresses #20.
Centers the mushroom picker.
Increase width of game box

Addresses #20.
Increases the width of the game box to 300 pixels.
Use jquery.number to format numbers

Addresses #20.
Numbers are now nicely formatted.