GEOMESA-254,269 Improving ingest in GeoMesa-tools

GEOMESA-254,269 Improve ingest in geomesa-tools,

fixed up csv parser in SVIngest so that quotes are not required around geometry field (except for cases when WKT uses commas like polygons), and updated readme. Ingest command now splits up into sub-commands per format, ie ingest csv, tsv, etc.