Added some abstract decorators for certain abstract classes.
Added some abstract decorators for certain abstract classes.

jirenz/CS229_Project,noa/hearthbreaker,Ragowit/hearthbreaker,slaymaker1907/hearthbreaker,kingoflolz/hearthbreaker,danielyule/hearthbreaker,anuragpapineni/Hearthbreaker-evolved-agent,pieiscool/edited-hearthbreaker,anuragpapineni/Hearthbreaker-evolved-agent,pieiscool/edited-hearthbreaker,slaymaker1907/hearthbreaker,anuragpapineni/Hearthbreaker-evolved-agent