Fix inserting touch action stylesheet for Shadow DOM Polyfill

src/touch-action.js

@@ -34,5 +34,10 @@
   });
   var el = document.createElement('style');
   el.textContent = styles;
-  document.head.appendChild(el);
+  // Use querySelector instead of document.head to ensure that in
+  // ShadowDOM Polyfill that we have a wrapped head to append to.
+  var h = document.querySelector('head');
+  // document.write + document.head.appendChild = crazytown
+  // use insertBefore instead for correctness in ShadowDOM Polyfill
+  h.insertBefore(el, h.firstChild);
 })();