Maintenance release

Bugfixes:

• ReferenceSchema#getUnprocessedProperties() now returns correct values (also ReferenceSchema#getTitle(), #getDescription() and #getSchemaLocation())
  • reported and fixed by @NaveenGurram , in multiple iterations
• fixing problem related to referencing a schema by "$id" if the "$id" value starts with a hashmark or is a valid json pointer - reported in #270
• fixing problem where inline dereferencing by $id was broken if the schema contained a property called "$id" in "properties" - reported in #271
• fixing misleading error message for "exclusiveMaximum" errors - contributed by @zgyorffi