MAHOUT-1579 Implement a data model which can load data from hadoop files...

Now mahout deal with the data which stored in hdfs, it should run mapred job.
I Implement a data model which can load data from hadoop filesystem directly, 
and process data like FileDataModel.
Hi, sscdotopen
Thanks for your comment. Your suggestion is very valuable. I have remove the dependencies of mini cluster. And refactor the tests to use RawLocalFileSystem.