Updated for compatibility with Pig 0.12 and Hadoop 2.0.x. AvroStorage() is now built-in to Pig; Piggybank not required.
Updated MongoStorage() to MongoInsertStorage as described in https://github.com/alabid/mongo-hadoop/blob/issues/pig/mongo-update-storage/pig/README.md. Updated MongoDB Java driver download link to snapshot link and added register path to mongo.pig.