update polymer to 2.0

Author: jshortall

bower.json

@@ -2,11 +2,11 @@
   "name": "pmp-simple-date-input",
   "main": "pmp-simple-date-input.html",
   "dependencies": {
-    "polymer": "Polymer/polymer#^1.7.0",
+    "polymer": "Polymer/polymer#^2.0.0",
     "moment": "^2.15.2",
-    "paper-input": "PolymerElements/paper-input#^1.1.20",
-    "iron-input": "PolymerElements/iron-input#^1.0.10",
-    "iron-form-element-behavior": "PolymerElements/iron-form-element-behavior#^1.0.6"
+    "paper-input": "PolymerElements/paper-input#^2.0.0",
+    "iron-input": "PolymerElements/iron-input#^2.0.0",
+    "iron-form-element-behavior": "PolymerElements/iron-form-element-behavior#^2.0.0"
   },
   "devDependencies": {
     "iron-component-page": "PolymerElements/iron-component-page#^1.0.0",