NOJRA Nbfix simplified CLI API

Simplified things by handling default Kryo and SparkConf in the base classes so no more requirement to override the driver.start for setting that up.

made changed to the NB driver commenting out the `start` override, which now seemed unneeded.

Also removed the assemble/job.xml in the spark module. This is not the way to do it but I still think we need to revisit a method for creating an all-deps jar. Users linking to Mahout will have a hard time running their code if they have to guess at which jars (or version of jars) are not on their classpath.