Implemented Clockwork Giant
Implemented Armor Plating, one of many Spare Parts
Implemented Emergency Coolant

Yet another Spare Part
Implemented Finicky Cloakfield

Spare Part, anyone?
Implemented Reversing Switch

What's this? A head? Ah, no... just a spare part.
Implemented Rusty Horn

If I have seen a head laying around? Nope! Just Spare Parts. Can't you
hear? NOTHING TO SEE HERE!
Implemented Time Rewinder

I said only Spare Parts around here. Off you go!
Implemented Whirling Blades, the last Spare Part

This blade has nothing to do with that head laying around here! It's
just a spare part, I promise!
Implemented Clockwork Gnome

The same list of spare parts will be used by four other cards. Maybe
should lift that part out in some way?
Implemented Cobalt Guardian
Implemented Cobra Shot
Small fixes for some of the Spare Parts
Implemented Coghammer

Tried to do the battlecry with the new system, but it doesn't work for
weapons yet?
Small fix for Conceal
flake8
Fixed an infinite loop that sometimes occurred in RandomAgent.

Closes #65
Removed dead code
Implemented Crackle
Implemented Darkbomb
Fixed a memory leak caused by bad debugging code.  Closes #68