adding failing integ test for #271

Author: erosb

tests/vanilla/src/main/resources/org/everit/json/schema/issues/issue271/remotes/dummy-schema.json

@@ -0,0 +1,10 @@
+{
+  "properties": {
+    "$id": {
+      "type": "string"
+    },
+    "other": {
+      "$ref": "http://localhost:1234/dummy-schema.json"
+    }
+  }
+}

tests/vanilla/src/main/resources/org/everit/json/schema/issues/issue271/schema.json

@@ -0,0 +1,3 @@
+{
+  "$id": "id-value"
+}