add test to draft4 that checks that patternProperties are not counted
as additionalProperties
Merge remote-tracking branch 'tolsen/patternProperties-are-not-additionalProperties' into develop

* tolsen/patternProperties-are-not-additionalProperties:
  add test to draft4 that checks that patternProperties are not counted as additionalProperties
patternProperties are not additionalProperties in draft3 either.