feat(jQuery): upgrade to jQuery to 2.1.1

The data jQuery method was re-implemented in 2.0 in a secure way. This made
current hacky Angular solution to move data between elements via changing the
value of the internal node[jQuery.expando] stop working. Instead, just copy the
data from the first element to the other one.

Testing cache leaks on jQuery 2.x is not possible in the same way as it's done
in jqLite or in jQuery 1.x as there is no publicly exposed data storage. One
way to test it would be to intercept all places where a jQuery object is created
to save a reference to the underlaying node but there is no single place in the
jQuery code through which all element creation passes (there are various
shortcuts for performance reasons). Instead we rely on jqLite.cache testing
to find potential data leaks.

BREAKING CHANGE: Angular no longer supports jQuery versions below 2.1.1.

docs/content/misc/faq.ngdoc

@@ -75,14 +75,15 @@ The size of the file is < 36KB compressed and minified.
 Yes, you can use widgets from the [Closure Library](https://developers.google.com/closure/library/)
 in Angular.
 
+
 ### Does Angular use the jQuery library?
 
 Yes, Angular can use [jQuery](http://jquery.com/) if it's present in your app when the
 application is being bootstrapped. If jQuery is not present in your script path, Angular falls back
 to its own implementation of the subset of jQuery that we call {@link angular.element  jQLite}.
 
-Due to a change to use `on()`/`off()` rather than `bind()`/`unbind()`, Angular 1.2 only operates with
-jQuery 1.7.1 or above. However, Angular does not currently support jQuery 2.x or above.
+Angular 1.3 only supports jQuery 2.1 or above. jQuery 1.7 and newer might work correctly with Angular
+but we don't guarantee that.
 
 
 ### What is testability like in Angular?