Demo for query storing

Change-Id: I947bcac841992c3f6cfd01ab337c265b0d01cb70
diff --git a/node_modules/error/io.js b/node_modules/error/io.js
new file mode 100644
index 0000000..76661ce
--- /dev/null
+++ b/node_modules/error/io.js
@@ -0,0 +1,21 @@
+'use strict';
+
+module.exports = IOError;
+
+function IOError(cause, prefix) {
+    var err = new Error(prefix + ': ' + cause.message);
+
+    Object.defineProperty(err, 'type', {
+        value: 'error.IOError',
+        configurable: true,
+        enumerable: true
+    });
+    err.name = 'WrappedIOError';
+    err.statusCode = 500;
+    Object.defineProperty(err, 'cause', {
+        value: cause,
+        configurable: true,
+        enumerable: false
+    });
+    return err;
+}