fix(jqLite): use jQuery only if jQuery.fn.on present

Make Angular not bind to jQuery versions older than 1.7 since older
versions of jQuery do not support necessary on()/off() methods.

src/Angular.js

@@ -1332,8 +1332,9 @@ function snake_case(name, separator){
 function bindJQuery() {
   // bind to jQuery if present;
   jQuery = window.jQuery;
-  // reset to jQuery or default to us.
-  if (jQuery) {
+  // Use jQuery if it exists with proper functionality, otherwise default to us.
+  // Angular 1.2+ requires jQuery 1.7.1+ for on()/off() support.
+  if (jQuery && jQuery.fn.on) {
     jqLite = jQuery;
     extend(jQuery.fn, {
       scope: JQLitePrototype.scope,