title: Implementing Screen flow with Activiti
body: <p>I want to implement a basic form based screen flow in Activiti(New to BPMN), all I want to do, is 
  <code>user requests form -&gt; form is rendered -&gt; user fills and submits the form -&gt; The form is validated -&gt; "Success" the user gets his id -&gt; "failure" the system displays error message</code>
  Instead of using any Activiti specific form components, I would like the whole interaction between the client the process engine to happen over REST, would like to know if this is possible.</p>