[ci skip] Point to latest polymer 2.0 versions.

bower.json

@@ -19,30 +19,36 @@
   "homepage": "https://github.com/PolymerElements/iron-collapse",
   "ignore": [],
   "dependencies": {
-    "iron-resizable-behavior": "PolymerElements/iron-resizable-behavior#2.0-preview",
-    "polymer": "Polymer/polymer#^2.0.0-rc.1"
+    "iron-resizable-behavior": "PolymerElements/iron-resizable-behavior#1 - 2",
+    "polymer": "Polymer/polymer#1.9 - 2"
   },
   "devDependencies": {
-    "iron-component-page": "PolymerElements/iron-component-page#2.0-preview",
-    "paper-styles": "PolymerElements/paper-styles#2.0-preview",
-    "iron-demo-helpers": "PolymerElements/iron-demo-helpers#2.0-preview",
-    "web-component-tester": "Polymer/web-component-tester#^6.0.0-prerelease.6",
-    "webcomponentsjs": "webcomponents/webcomponentsjs#^1.0.0-rc.1"
+    "iron-component-page": "PolymerElements/iron-component-page#1 - 2",
+    "paper-styles": "PolymerElements/paper-styles#1 - 2",
+    "iron-demo-helpers": "PolymerElements/iron-demo-helpers#1 - 2",
+    "web-component-tester": "^6.0.0",
+    "webcomponentsjs": "webcomponents/webcomponentsjs#^1.0.0"
   },
   "variants": {
     "1.x": {
       "dependencies": {
         "iron-resizable-behavior": "PolymerElements/iron-resizable-behavior#^1.0.0",
-        "polymer": "Polymer/polymer#^1.0.0"
+        "polymer": "Polymer/polymer#^1.9"
       },
       "devDependencies": {
         "iron-component-page": "PolymerElements/iron-component-page#^1.0.0",
         "paper-styles": "PolymerElements/paper-styles#^1.0.0",
         "iron-demo-helpers": "PolymerElements/iron-demo-helpers#^1.0.0",
         "web-component-tester": "^5.0.0",
         "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0"
+      },
+      "resolutions": {
+        "webcomponentsjs": "^0.7"
       }
     }
   },
-  "main": "iron-collapse.html"
+  "main": "iron-collapse.html",
+  "resolutions": {
+    "webcomponentsjs": "^1.0.0"
+  }
 }