title: (O)Auth with ExtJS
body: <p>today i tried to get django-piston and ExtJS working. I used the ExtJS restful example and the piston example to create a little restful webapp. Everything works fine except the authentication. </p>
  
  <p>Whats the best way to get Basic/Digest/OAuth authentication working with ExtJS?
  Atm I'm not sure where to set the Username/Password.</p>
  
  <p>Thanks</p>