title: Specify zone/region in gcloud preview app deploy
body: <p>If I try to deploy my app with <code>gcloud preview app deploy</code> i will get a running instance in us-central1.</p>
  
  <p>How do i select the region or zone? My Cloud SQL instance is located in Europe so my App Engine needs to run in Europe too!</p>
  
  <p>I've tried to set it by gclod config but this seems to have no effect:</p>
  
  <pre><code>gcloud config list
  [compute]
  region = europe-west1
  zone = europe-west1-b
  [core]
  account = my@email
  disable_usage_reporting = True
  project = myproject
  user_output_enabled = True
  </code></pre>