closes #343 added a map reduce job for initializing a stress test table

I am currently running this on a 20 node EC2 cluster loading 1 billion numbers into accumulo.  I have 17 reducers.  While doing this I noticed that data was being written to the accumulo table in sorted order by all of the reducers.  At first all of the reducers were writing to one tablet.  They started to spread out to a few tablets, but this is not good.