GEOMESA-111 Remove the AggregatingCombiner

* In order to remove the AggregatingCombiner, we needed a new 'Is this a data row?' signal.
GEOMESA-112 adding commons-vfs2
GEOMESA-106 PR changes
Merge branch 'accumulo1.5.x/1.x' of github.com:locationtech/geomesa into accumulo1.5.x/1.x
Merge branch 'accumulo1.5.x/1.x' into wps