title: Camunda delete all variables on process
body: <p>In the camunda rest api is there a way to delete all the process instance variables in one go.</p>
  
  <p>I thought I read some documentation that said you could do it using...</p>
  
  <pre><code>DELETE http://localhost:8080/contextRoot/rest/engine/default/process-instance/{id}/variables
  </code></pre>
  
  <p>But when I try that I get a ...</p>
  
  <pre><code>{
    "timestamp": 1479705176075,
    "status": 405,
    "error": "Method Not Allowed",
    "message": "Method Not Allowed",
    "path": "/contextRoot/rest/engine/default/process-instance/14/variables"
  }
  </code></pre>
  
  <p>If I add a variable id I am able to delete one by one but that's not what I'm after.</p>
  
  <p>thanks</p>