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.
If its possible to move the args for each different type (i.e. geojson, csv, etc) into classes named ```GeoJsonIngest.scala```, ```CSVIngest.scala``` etc. and then register them all in the main class...perhaps there can be a trait that forces an ingester to define its scopt args