Added this week's Naxxramas cards to cards.csv
Implemented Unstable Ghoul
Implemented Webspinner.

Also made some small changes to related Warlock cards.
Small update to Captain's Parrot
Implemented Loatheb
Flake8 Fixes
Implemented Duplicate
Implemented Stoneskin Gargoyle
Implemented Sludge Belcher
Fix for Stoneskin Gargoyle to make it heal at the beginning of the turn

Previously, it had just been resetting the health.
Windfury bugfix
Minion copy bugfix

Got taco's MCTS AI to work with this fix.
Discard bugfix
Created some example effects
Merge remote-tracking branch 'origin/effects' into effects
Created a random agent.
Added some testing code for the random agent for benchmarking purposes.
Game end bug fixes

Fixed a bug resulting in games not ending after they had been copied
Updated so that choose_index also passes the player.
Flake8 fixes