title: Sentry raven-java user context
body: <p>How can I set the user context with the sentry raven-java client? </p>
  
  <p>I've tried adding a <code>user_email</code> tag, and adding <code>user_email</code> to the MDC. They both work as expecting, with the tag going to tags, and MDC going to additional data, but neither sets the sentry user context.</p>
  
  <p>I also use sentry with javascript, and with raven-js, this works great:</p>
  
  <pre><code>Raven.setUserContext({
      email: '',
      id: ''
  });
  </code></pre>
  
  <p>Is there a java equivalent?</p>