Mortar changes for mongo-hadoop connector

* Fix bugs with MongoOutputFormat’s updateKeys and multiUpdate.
* Better error message when people can’t connect to Mongo
* Added tests for splitting code
* bytearray is converted to pig DataByteArray
* If we don’t know the field of an inner object use convertBSONtoPigType
* Handle inner bags without a schema
* In schemaless mode convert a list to a bag. 
* Add option for loading the whole record as a chararray