Closes #147 - Created fluo-accumulo module for Accumulo iterators &
formatter.  Made io.fluo.accumulo.classpath a required property and
configured the integration tests to set the correct accumulo classpath
Merge pull request #149 from mikewalch/fluo-147

Closes #147 - Created fluo-accumulo module for Accumulo iterators & formatter
closes #153 many improvements to type layer (test, docs, refinement)