whoops
wrong interface
should't extend Tabbable
rewrote Tabbable to simply tabbed forms
add prefix to Tabbable to allow inclusion in other forms
added date and datetime element for simplicity
changed order of injection to fix bugs

- setting variables before injecting the right servicelocator
  resulted in bugs if the setXXX method requires the servicelocator
- setting the attributes _after_ setting the class overrides the class,
  this resulteed in bugs in elements where both attributes and class
  were defined
moved PageBundle to the new form system
moved NewsBundle to the new form system
moved GalleryBundle to the new form system
moved part of FormBundle to the new form system
fixes for some tabbed forms