Closes #147 - Created fluo-accumulo module for Accumulo iterators & formatter

Pull request for #147

Made io.fluo.accumulo.classpath a required property and configured the integration tests to set the correct accumulo classpath
I tried changing this to `Accumulo Extensions` and running the build.  The output at the end of the build looked like the following, which looks nicer to me.  This is just my personal preference, feel free to ignore.   I would not want to change the artifactId to anything longer, I like `fluo-accumulo`.

```
[INFO] Reactor Summary:
[INFO] 
[INFO] Parent ............................................ SUCCESS [1.309s]
[INFO] API ............................................... SUCCESS [2.349s]
[INFO] Accumulo Extensions ............................... SUCCESS [0.332s]
[INFO] Core .............................................. SUCCESS [1.394s]
[INFO] MapReduce ......................................... SUCCESS [0.254s]
[INFO] Stress ............................................ SUCCESS [0.300s]
[INFO] Cluster ........................................... SUCCESS [0.276s]
[INFO] Distribution ...................................... SUCCESS [11.532s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 18.110s
[INFO] Finished at: Mon Aug 25 13:15:13 EDT 2014
[INFO] Final Memory: 37M/1843M
[INFO] ------------------------------------------------------------------------

```