add promise Q example

Author: Joe Gallo

examples/testPromiseQ.js

@@ -0,0 +1,13 @@
+"use strict";
+
+var Client = require("./../lib/index");
+var Q = require("q");  // npm install q
+
+var github = new Client({
+    debug: false,
+    Promise: Q.Promise
+});
+
+github.users.getById({ id: '5057219' }).then(function(res) {
+    console.log(res);
+});