* Ability to set reducers in groupBy (see .reducers) * Ability to set reducers in join (see named parameter e.g. reducers=12) * Some bug fixes around serializable objects. * Increases the cascading spill thresholds (to 100k) * Adds numeric hashing so joining longs and ints are okay. * Enables optimized joins ("map-side" join). See RichPipe.joinWithTiny.