Update bower.json for Polymer elements and add PRESUBMIT.py

third_party/polymer/v1_0/components/iron-behaviors/.bower.json

 {
   "name": "iron-behaviors",
-  "version": "1.0.3",
+  "version": "1.0.4",
   "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#^1.0.0",
     "iron-a11y-keys-behavior": "PolymerElements/iron-a11y-keys-behavior#^1.0.0"
   },
   "devDependencies": {
     "paper-styles": "polymerelements/paper-styles#^1.0.2",
     "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": "*",
     "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0"
   },
   "homepage": "https://github.com/PolymerElements/iron-behaviors",
-  "_release": "1.0.3",
+  "_release": "1.0.4",
   "_resolution": {
     "type": "version",
-    "tag": "v1.0.3",
-    "commit": "a8e8245c60d65712e2f0ac727f1ce3529dcf395d"
+    "tag": "v1.0.4",
+    "commit": "8792edd457de697a74f398c09b67df30adf7d866"
   },
   "_source": "git://github.com/PolymerElements/iron-behaviors.git",
   "_target": "^1.0.0",
   "_originalSource": "PolymerElements/iron-behaviors"
 }