fixed riak urls

<table>
  <tr>
    <th>Old URL</th>
    <th>New URL</th>
    <th>Reason</th>
  </tr>
  <tr>
    <td>http://riakjs.org</td>
    <td>http://riak-js.org</td>
    <td>Wrong URL</td>
  </tr>
  <tr>
    <td>http://www.basho.com/Riak.html</td>
    <td>http://www.basho.com/</td>
    <td>404 Not Found</td>
  </tr>
</table>