Roll Polymer to 1.3.1

third_party/polymer/v1_0/components-chromium/paper-drawer-panel/bower.json

 {
   "name": "paper-drawer-panel",
-  "version": "1.0.6",
+  "version": "1.0.7",
   "description": "A responsive drawer panel",
   "authors": [
     "The Polymer Authors"
   ],
   "keywords": [
     "web-components",
     "polymer",
     "drawer",
     "responsive",
     "layout"
   ],
   "repository": {
     "type": "git",
     "url": "git://github.com/PolymerElements/paper-drawer-panel.git"
   },
   "license": "http://polymer.github.io/LICENSE.txt",
   "homepage": "https://github.com/PolymerElements/paper-drawer-panel",
   "dependencies": {
     "iron-media-query": "PolymerElements/iron-media-query#^1.0.0",
     "iron-resizable-behavior": "PolymerElements/iron-resizable-behavior#^1.0.0",
     "iron-selector": "PolymerElements/iron-selector#^1.0.0",
     "polymer": "Polymer/polymer#^1.1.0"
   },
   "devDependencies": {
     "iron-component-page": "PolymerElements/iron-component-page#^1.0.0",
     "paper-button": "PolymerElements/paper-button#^1.0.0",
     "paper-styles": "PolymerElements/paper-styles#^1.0.0",
+    "iron-test-helpers": "PolymerElements/iron-test-helpers#^1.0.0",
     "test-fixture": "PolymerElements/test-fixture#^1.0.0",
-    "web-component-tester": "polymer/web-component-tester#^3.4.0",
+    "web-component-tester": "^4.0.0",
     "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0"
   },
   "main": "paper-drawer-panel.html",
   "ignore": []
 }