Add additional account app templates

This works around use block "body" when we need block "content".

Remove dj-user-accounts

That's a nice macro, but we don't need it.
dj-user-accounts stands in the way of using more generic AUTN_METHODS

More dashboard and settings themes (#29)

* Proposals forms now have a header panel

* Adds panels to the speaker forms

* Imports latest pinax accounts templates

* speakers/base and proposals/base now derive from utility_page.html

* Most login forms now derive from take flight themes

* Missed email_confirm

* More accounts bits

* Restructures login form

* Puts submit etc buttons inside fieldset borders