adding integration test to #41

Author: erosb

tests/src/test/resources/org/everit/json/schema/issues/issue41/schema.json

@@ -0,0 +1,13 @@
+{
+	"properties" : {
+		"prop" : {
+			"type" : "object",
+			"$ref" : "#/definitions/PropDef"
+		}
+	},
+	"definitions" : {
+		"PropDef" : {
+			"required" : ["a", "b"]
+		}
+	}
+}

tests/src/test/resources/org/everit/json/schema/issues/issue41/subject-invalid.json

@@ -0,0 +1,5 @@
+{
+	"prop" : {
+		"a" : 2
+	}
+}