Added ability for mob spawners to drop an egg for the corresponding type of mob that they are. (Replaces old mob_spawner types method)
Added ability for mob spawners to be set by right clicking with an egg. One time use in survival, unlimited use in creative mode. (also to replace the old way for trading set mob spawners.)
Removed the message "You are now holding a pig spawner" whenever you flip over a mob spawner in your inventory.
