update elements and fix some bugs

lib/src/google-apis/google-maps-api.html

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 This code may only be used under the BSD style license found at https://polymer.github.io/LICENSE.txt
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 <link rel="import" href="../polymer/polymer.html">
 <link rel="import" href="../iron-jsonp-library/iron-jsonp-library.html">
 
 <script>
 /**
 Dynamically loads the Google Maps JavaScript API, firing the `api-load` event when ready.
 
 #### Example
 
     <google-maps-api api-key="abc123" version="3.exp"></google-maps-api>
     <script>
       var mapsAPI = document.querySelector('google-maps-api');
       mapsAPI.addEventListener('api-load', function(e) {
         // this.api === google.maps
       });
     <script>
 
 Any number of components can use `<google-maps-api>` elements, and the library will only be loaded once.
 
-@blurb Element wrapper around Google Maps API.
+@summary Element wrapper around Google Maps API.
 
  */
   Polymer({
 
     is: 'google-maps-api',
 
     behaviors: [
       Polymer.IronJsonpLibraryBehavior
     ],
 
@@ skipping 16 matching lines @@
       /**
        * A Maps API for Business Client ID. To obtain a Maps API for Business Client ID, see developers.google.com/maps/documentation/business/.
        * If set, a Client ID will take precedence over an API Key.
        */
       clientId: {
         type: String,
         value: ''
       },
 
       /**
-       * The libraries to load with this map. For more information
-       * see https://developers.google.com/maps/documentation/javascript/libraries.
-       */
-      libraries: {
-        type: String,
-        value: ''
-      },
-
-      /**
        * Version of the Maps API to use.
        */
       version: {
         type: String,
         value: '3.exp'
       },
 
       /**
        * The localized language to load the Maps API with. For more information
        * see https://developers.google.com/maps/documentation/javascript/basics#Language
@@ skipping 22 matching lines @@
        * Name of event fired when library is loaded and available.
        */
       notifyEvent: {
         type: String,
         value: 'api-load'
       },
 
       /** @private */
       libraryUrl: {
         type: String,
-        computed: '_computeUrl(mapsUrl, version, libraries, apiKey, clientId, language, signedIn)'
+        computed: '_computeUrl(mapsUrl, version, apiKey, clientId, language, signedIn)'
       }
     },
 
-    _computeUrl: function(mapsUrl, version, libraries, apiKey, clientId, language, signedIn) {
+    _computeUrl: function(mapsUrl, version, apiKey, clientId, language, signedIn) {
       var url = mapsUrl + '&v=' + version;
 
-      if (libraries) {
-        url += "&libraries=" + libraries;
-      }
+      // Always load all Maps API libraries.
+      url += '&libraries=drawing,geometry,places,visualization';
 
       if (apiKey && !clientId) {
         url += '&key=' + apiKey;
       }
 
       if (clientId) {
         url += '&client=' + clientId;
       }
 
       if (language) {
         url += '&language=' + language;
       }
 
       if (signedIn) {
         url += '&signed_in=' + signedIn;
       }
       return url;
     },
 
     /**
      * Provides the google.maps JS API namespace.
      */
     get api() {
       return google.maps;
     }
   });
 </script>