GEOMESA-237 Convert AvroSimpleFeature to WKB

* Use WKB (Well Known Binary) instead of WKT (Well Known Text) for AvroSimpleFeature
* Results in 20x speedup on serialization/deserialization
Merge branch 'accumulo1.5.x/1.x' into f_geomesa_tools
export, explain, delete, list, and create should do things. still trying to figure out whether it's the things we want them to do