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? 
It will walk a dir tree finding file by pattern match, not implemented yet and AFAIK not implemented in HDFS which will look in a single dir for pattern matched file names. I'll look to see if Sean did something like this already.

I'm not satisfied with the packaging yet so I agree. If you know of something that does this be happy to take it out.

Yes, I will double check that everything has the license statement.