Update Polymer components.

third_party/polymer/components/iron-behaviors/.bower.json

 {
   "name": "iron-behaviors",
-  "version": "1.0.17",
+  "version": "1.0.18",
   "description": "Provides a set of behaviors for the iron elements",
   "private": true,
   "authors": [
     "The Polymer Authors"
   ],
   "repository": {
     "type": "git",
     "url": "git://github.com/PolymerElements/iron-behaviors.git"
   },
   "main": [
     "iron-button-state.html",
     "iron-control-state.html"
   ],
   "license": "http://polymer.github.io/LICENSE.txt",
   "dependencies": {
     "polymer": "Polymer/polymer#^1.2.0",
     "iron-a11y-keys-behavior": "PolymerElements/iron-a11y-keys-behavior#^1.0.0"
   },
   "devDependencies": {
     "paper-styles": "polymerelements/paper-styles#^1.0.2",
     "paper-input": "polymerelements/paper-input#^1.0.0",
     "iron-test-helpers": "polymerelements/iron-test-helpers#^1.0.0",
     "iron-component-page": "polymerelements/iron-component-page#^1.0.0",
     "test-fixture": "polymerelements/test-fixture#^1.0.0",
     "web-component-tester": "^4.0.0",
     "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0"
   },
   "ignore": [],
-  "homepage": "https://github.com/PolymerElements/iron-behaviors",
-  "_release": "1.0.17",
+  "homepage": "https://github.com/polymerelements/iron-behaviors",
+  "_release": "1.0.18",
   "_resolution": {
     "type": "version",
-    "tag": "v1.0.17",
-    "commit": "ef8e89b5f0aa4e8a6b51ca6491ea453bf395f94f"
+    "tag": "v1.0.18",
+    "commit": "7c07f18d747aee2c31330511ae8f780554ff98d8"
   },
-  "_source": "https://github.com/PolymerElements/iron-behaviors.git",
+  "_source": "https://github.com/polymerelements/iron-behaviors.git",
   "_target": "^1.0.0",
-  "_originalSource": "PolymerElements/iron-behaviors"
+  "_originalSource": "polymerelements/iron-behaviors"
 }