update bower deps

bower.json

@@ -19,26 +19,25 @@
   "homepage": "https://github.com/PolymerElements/iron-form",
   "ignore": [],
   "dependencies": {
-    "polymer": "Polymer/polymer#^2.0.0-rc.1",
-    "iron-ajax": "PolymerElements/iron-ajax#2.0-preview"
+    "polymer": "Polymer/polymer#1.9 - 2",
+    "iron-ajax": "PolymerElements/iron-ajax#1 - 2"
   },
   "devDependencies": {
-    "iron-component-page": "PolymerElements/iron-component-page#2.0-preview",
-    "iron-demo-helpers": "PolymerElements/iron-demo-helpers#2.0-preview",
-    "paper-button": "PolymerElements/paper-button#2.0-preview",
-    "paper-checkbox": "PolymerElements/paper-checkbox#2.0-preview",
-    "paper-dropdown-menu": "PolymerElements/paper-dropdown-menu#2.0-preview",
-    "paper-input": "PolymerElements/paper-input#2.0-preview",
-    "paper-spinner": "PolymerElements/paper-spinner#2.0-preview",
-    "paper-styles": "PolymerElements/paper-styles#2.0-preview",
-    "test-fixture": "PolymerElements/test-fixture#^3.0.0-rc.1",
-    "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",
+    "iron-demo-helpers": "PolymerElements/iron-demo-helpers#1 - 2",
+    "paper-button": "PolymerElements/paper-button#1 - 2",
+    "paper-checkbox": "PolymerElements/paper-checkbox#1 - 2",
+    "paper-dropdown-menu": "PolymerElements/paper-dropdown-menu#1 - 2",
+    "paper-input": "PolymerElements/paper-input#1 - 2",
+    "paper-spinner": "PolymerElements/paper-spinner#1 - 2",
+    "paper-styles": "PolymerElements/paper-styles#1 - 2",
+    "web-component-tester": "~6.0.0",
+    "webcomponentsjs": "~1.0.0"
   },
   "variants": {
     "1.x": {
       "dependencies": {
-        "polymer": "Polymer/polymer#^1.1.0",
+        "polymer": "Polymer/polymer#^1.9",
         "iron-ajax": "PolymerElements/iron-ajax#^1.0.0"
       },
       "devDependencies": {