add module to output data directly to HDFS

It would be nice to be able to use hydra as a system to process data streams and emit them to HDFS storage.  This branch enables that functionality.  It likely added a ton of transitive hadoop dependencies so it may be desirable to make this an optional module.  Basic job config looks like:

factory:{
  type:"hdfs",
  hdfsURL:"hdfs://lhn00.clearspring.local:8020",
  dir:"split",
},