fix(jqLite): Chrome specific issue for <select required>

When adding an `<option selected="selected">` into the DOM, put
the property `selected` to `true`. This works around an issue
present at Chrome where the new `<option>` is selected at the DOM
not selected at the UI.

Closes #6828

Author: lgalfaso

src/jqLite.js

@@ -904,6 +904,10 @@ forEach({
     var index = element, parent = element.parentNode;
     forEach(new JQLite(newElement), function(node){
       parent.insertBefore(node, index.nextSibling);
+      // Workaround for Chrome. Check #6828
+      if (nodeName_(node) === 'OPTION' && (new JQLite(node)).attr('selected') === 'selected') {
+        node.selected = true;
+      }
       index = node;
     });
   },