Updated offline co-op games list as of 7-22-2013

Made some updates to the co-op list.

Guacamelee
Tales of Graces F?
Little Big Planet 2
Portal 2
Killzone 3
Uncharted 3
Adventures of Tin Tin
Castlestorm 
Terraria
Far Cry 3
BattleBlock Theater
Lego Batman 2
Deathsmiles
Anomaly: Warzone Earth
Twisted Metal for PS3
Ugly Americans Apocalypsegeddon
 Lord of the Rings: War in the North
Ratchet and Clank: Full Frontal Assault