title: haml with rails3 (git master) and devise: form_for syntax change breaks haml -- suggestions?
body: <p>i am trying to get haml working with a rails3 project; 
  since i am quite far in the modeling i wanted to go to the haml views now --
  seems that the current haml (git master) does not work together with the current rails3 git master because of some syntax changes in rails3 form_for</p>
  
  <p>does anyone have more information on the syntax changes?
  is there a temporary workaround to use haml with rails3? (i am on a deadline) :(</p>
  
  <p>see also: <a href="http://groups.google.at/group/plataformatec-devise/browse_thread/thread/6e0b403769c47b8c?hl=de" rel="nofollow noreferrer">http://groups.google.at/group/plataformatec-devise/browse_thread/thread/6e0b403769c47b8c?hl=de</a></p>
  
  <p>thanks!</p>