GEOMESA-122 Split OR filters into multiple queries

* Created a OrSplittingFilter Visitor which helps break apart a more complex Filter into pieces.
* Moved up the SelfClosingBatchScanner into core and implemented a basic CloseableIterator trait.
GEOMESA-131 Implemented get properties methods in AvroSimpleFeature

Tests included in AvroSimpleFeatureTest.scala
GEOMESA-149 Update GeoServer deployment instructions

* Includes commons-codec jar.
GEOMESA-133 SimpleFeature UserData lost in IndexQueryPlanner

Add functions to transfer the SimpleFeatureType UserData into and out of IteratorSettings, which would otherwise be lost
when passed to the Iterators via DataUtilities.encodeType