Implemented Haunted Creeper.

Also made Harvest Golem copyable (as per issue #29)
Added copy testing for The Beast, as per #29
Implemented Nerub'ar Weblord.

Also made Venture Co copyable as per Issue #29
Fix for cards.csv
Another fix for cards.csv
Updated return_to_hand battlecry
Implemented Anub'ar Ambusher
Added new tests for Anub'ar Ambusher
Implemented Poison Seeds.
Made Tundra Rhino copyable as per Issue #29.

Also made some small changes to how charge works (it ignores exhausted,
rather than having to manually set it to true)
Made Starving Buzzard copyable as per #29
Made Timber Wolf copyable.

Now all hunter cards are copyable as per Issue #29
Made games able to be copied.
Now, many different outcomes can be generated and tested without
 restarting the game.
Merge branch 'master' of https://github.com/danielyule/hearthstone-simulator