Mahout 1541

MAHOUT-1541 WIP, need access to an RDD, which used to be in a DrmLike[Int]. Still need the DrmLike to pass in to cooccurrence but need the RDD to write a text file. CheckpointedDrmSpark doesn't have the DrmLike? 
This recursive search is very common in log file organization and a goal of this is to allow direct reading of log files in production environments.