GEOMESA-357 Cache SimpleFeatureBuilders

* Switched to using ThreadLocal SimpleFeatureBuilders for IndexEntryDecoder use.
GEOMESA-404 Fixed typo
GEOMESA-383 attribute index only iterator
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-346 Use WKT instead of HSQL as the EPSG reference