update polymer and platform.js

pkg/polymer/lib/src/js/polymer/layout.html

 <!--
 Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 <style shim-shadowdom>
 /*******************************
@@ skipping 219 matching lines @@
 /*******************************
           Other Layout
 *******************************/
 
 html /deep/ [block] {
   display: block;
 }
 
 /* ie support for hidden */
 html /deep/ [hidden] {
-  display: none;
+  display: none !important;
 }
 
 html /deep/ [relative] {
   position: relative;
 }
 
 html /deep/ [fit] {
   position: absolute;
   top: 0;
   right: 0;
@@ skipping 18 matching lines @@
   box-sizing: border-box;
   margin: 1em 0.5em;
   padding: 1em;
   background-color: white;
   -webkit-box-shadow: 0px 0px 0px 1px rgba(0, 0, 0, 0.1);
   box-shadow: 0px 0px 0px 1px rgba(0, 0, 0, 0.1);
   border-radius: 5px 5px 5px 5px;
 }
 
 </style>