Caterpillar now generates app.info.js, a metadata script. Resolves #12.

src/js/polyfills/runtime.polyfill.js

 // Copyright 2015 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 84 matching lines @@
 };
 
 /**
  * Defined during an API method if there was an error.
  */
 chrome.runtime.lastError = null;
 
 /**
  * The ID of the app, or null if not applicable.
  */
-// TODO(alger): Consider getting this from the Chrome App manifest.
 chrome.runtime.id = null;
 
 /**
  * Retrieves the JavaScript 'window' object for the background page running
  * inside the current app.
  *
  * Always sets an error in lastError since there is no background page for a
  * progressive web app.
  *
  * @param {function} callback Callback function on success or error.
@@ skipping 137 matching lines @@
 // TODO(alger): Implement or stub onSuspend.
 // TODO(alger): Implement or stub onSuspendCanceled.
 // TODO(alger): Implement or stub onUpdateAvailable.
 // TODO(alger): Implement or stub onBrowserUpdateAvailable.
 // TODO(alger): Implement or stub onConnect.
 // TODO(alger): Implement or stub onConnectExternal.
 // TODO(alger): Implement or stub onMessage.
 // TODO(alger): Implement or stub onMessageExternal.
 // TODO(alger): Implement or stub onRestartRequired.
 
-}).call(this);
+}).call(this);