fixed direction-up for webkit

Author: littlebigbot

src/uiSelectDirective.js

@@ -273,7 +273,7 @@ uis.directive('uiSelect',
               var offsetDropdown = uisOffset(dropdown);
 
               // Determine if the direction of the dropdown needs to be changed.
-              if (offset.top + offset.height + offsetDropdown.height > $document[0].documentElement.scrollTop + $document[0].documentElement.clientHeight) {
+              if (offset.top + offset.height + offsetDropdown.height > $document.scrollTop() + $document[0].documentElement.clientHeight) {
                 dropdown[0].style.position = 'absolute';
                 dropdown[0].style.top = (offsetDropdown.height * -1) + 'px';
                 element.addClass(directionUpClassName);