v0.06 Dev Update (Piston Hammer and Riot Shield Art)

+ Added Riot Shield (3 alternative sprites currently)
>> Would be more, but I lost part of the .psd during editing (because
hotkeys, oops)
+ Added Piston Hammer
>> First melee weapon I've done. It's meant to be a weapon made of scrap
for the most part, with an internal block that is shifted with
hydraulics, run by a small motor at the base of the head. Unwieldy, but
hits hard.