Added additionalProperties to Schema Object

Fixes #285

Author: webron

schemas/v2.0/schema.json

@@ -954,6 +954,9 @@
         "enum": {
           "$ref": "http://json-schema.org/draft-04/schema#/properties/enum"
         },
+        "additionalProperties": {
+          "$ref": "http://json-schema.org/draft-04/schema#/properties/additionalProperties"
+        },
         "type": {
           "$ref": "http://json-schema.org/draft-04/schema#/properties/type"
         },