GEOMESA-481 Remove use of decodeKey in STII and II.
GEOMESA-413 fixing transform of index iterator
GEOMESA-515 Factor out WrappedSTFilter

* Moved WrappedSTFilter out of iterators into IteratorHelpers trait
GEOMESA-526 Fix Spark RDD and Avro Encoders
Merge branch 'accumulo1.5.x/1.x' into fcr_jcommander