fix(jqLite): .data()/.bind() memory leak

Since angular attaches scope/injector/controller
into DOM it should clean up after itself. No need
to complain about memory leaks, since they can
only happened on detached DOM. Detached DOM would
only be in tests, since in production the DOM
would be attached to render tree and removal
would automatically clear memory.

test/testabilityPatch.js

@@ -42,7 +42,6 @@ afterEach(function() {
   var count = 0;
   forEachSorted(jqCache, function(value, key){
     count ++;
-    delete jqCache[key];
     forEach(value, function(value, key){
       if (value.$element) {
         dump('LEAK', key, value.$id, sortedHtml(value.$element));