title: Bad Request when creating new container in Tag-Manager
body: <p>I use the php sdk to interact with Google Tag Manager. When I run this code </p>
  
  <pre><code>    $client = new \Google_Client();
      $client-&gt;setClientId('xxxx');
      $client-&gt;setClientSecret('xxxx');
      $client-&gt;setAccessToken($token);
  
      $container = new \Google_Service_TagManager_Container();
      $container-&gt;setName('a-name');
      $container-&gt;setTimeZoneCountryId('America/Los_Angeles');
      $container-&gt;setTimeZoneId('US');
      $container-&gt;setUsageContext(array('web', 'android', 'ios'));
  
      $tagManager = new \Google_Service_TagManager($client);
      $tagManager-&gt;accounts_containers-&gt;create('xxx', $container);
  </code></pre>
  
  <p>then an exception is raised: <code>Error calling POST https://www.googleapis.com/tagmanager/v1/accounts/xxx/containers: (400) Bad Request</code>.</p>
  
  <p>The container data are the same as in the Google Developer console. A sample-request in the Google Developer Console creates the same Bad Request error.</p>
  
  <p>Any ideas? Is it a API bug?</p>