GEOMESA-486 CSV to Shapefile REST endpoint

Implements webservice deployed through Geoserver that
* receives a CSV file
* guesses a type schema for the columns
* creates a shapefile using the guessed schema or a user-supplied one
* exposes the zipped shapefile for geoserver ingest
@drmathochist Is this using the ScalaCheck pulled in by Specs2?  If so, we may need to submit a CQ for ScalaCheck...