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.
Ah, I had believed that the combinators with the RichFilter are necessary to help out the type inferencer.  From what I understood, I think the inferencer does it work in a single pass (as much as possible).  

It seems that the other obvious option of providing implicits from Ints to both Filters and RichFilters is sufficient.