WIP: GEOMESA: 72, 224, 225, command line tools

This is a work in progress PR (comments please) for the creation of a basic command line toolset for GeoMesa. This PR comprises three tickets: create a simple ingest tool to allow users to ingest a variety of GIS files (csv, tsv, shapefile, geojson, etc) into accumulo (geomesa-72),  exporting to csv and shapefiles (geomesa-224), and basic feature management (geomesa-225).  This PR serves as a foundation, to be improved on and expanded in function. 

at the moment all of this works to varying degrees, ingest not so much.
Agreed, dispatch on mime type to the right class and let it handle the format internally.