Add an uuid generator to jio.intro.js

src/jio/jio.intro.js

 var jio = function(spec) {
 
+    var generateUuid = function () {
+        var S4 = function () {
+            return Math.floor(
+                Math.random() * 0x10000 /* 65536 */
+            ).toString(16);
+        };
+        return S4() + S4() + "-" +
+            S4() + "-" +
+            S4() + "-" +
+            S4() + "-" +
+            S4() + S4() + S4();
+    };