GEOMESA-121 Rewrite input filters with ORs at top.

* Implemented rewriting arbitrary filters in Disjunctive Normal Form.
  This means that any ORs have been 'bubbled up', and any NOTs have been 'pushed down'.

  The resulting filter tree has at most one OR at the very top.
  Additionally, each child of that OR is an AND or a base filter.

* Implemented property-based tests for the filter rewriting functionality using ScalaCheck.

Of note:  A clear optimization is that attribute filters need not be split up or otherwise mangled.
This issue is as https://geomesa.atlassian.net/browse/GEOMESA-171

* Refactored some of the test code to pull data generation.
The filter rewriting seemed to be an obvious candidate for property-based testing, and I wanted to try that out.  During my testing, I've found it helpful as I've been able to see many more filters than I would have constructed by hand. 

That said, if we don't want random tests, I'm happy to keep the test code in my repo and use it to generate specific, hard-coded filters.