Added quick create ionic object in JS code

Makes it easy to include a few ionic files here and there.

js/controllers/navController.js

@@ -102,4 +102,4 @@
     },
 
   };
-})(window.ionic);
+})(ionic = window.ionic || {});

js/controllers/sideMenuController.js

@@ -188,4 +188,4 @@
     }
   };
 
-})(window.ionic);
+})(ionic = window.ionic || {});

js/controllers/tabBarController.js

@@ -119,4 +119,4 @@ TabBarController.prototype = {
   },
 }
 
-})(window.ionic);
+})(ionic = window.ionic || {});