Merge pull request #236 from Noahsark/master

Added music player that can if activated in preferences play music during the game. Added random background chooser (both developed by Noahsark).
Added method to player to put a list of cards on the bottom of the library in any order.
Added AnotherCard predicate working for cards in graveyard.
* Explosive Revelation and Drown In Filth - Targets are mandatory now.
[MMA] Added Myr Retriever, Death Denied, Erratic Mutation.
Merge pull request #3 from magefree/master

update code