GEOMESA-405, GEOMESA-406 fixing thread-safety and split issues in AccumuloDataStore
GEOMESA-403 fixing dtg,geom projection query
GEOMESA-352 fix for stats timing
GEOMESA-398 Fix GeoMesa script classpath issue

* Tweaked shell script.
GEOMESA-422 Closing Accumulo writer in finally block in StatWriter to prevent leaking open writers
GEOMESA-423 fixing shared connectors across stat writers

* keeping connector with each stat
* propagating errors in stat writer thread so that executor service will stop
Merge branch 'accumulo1.5.x/1.x' into fcr_export_transform
Styling change.