Oembed album

An demo html file would be like

```html
<!doctype html>
<html>
  <head>
    <title>PARI Talking Album widget embed</title>
  </head>
  <body>

    <div id="album-616795"></div>
    <script type="text/javascript">
      var __pariAlbum = {
              "widgetId": "album-616795",
              "url": "http://localhost:8000/albums/the-green-army/",
              "widgetWidth": "400px",
              "widgetHeight": "308px"
          };
      (function() {
            var script = document.createElement("script");
            script.type = "text/javascript";
            script.src = "http://localhost:8000/static/album/js/album_embed.js";
            var scripts = document.getElementsByTagName("script");
            scripts[scripts.length - 1].parentNode.appendChild(script);
          })();
      </script>
  </body>
</html>
```