Style the password reset process

To get the custom template to properly override the stock templates I
needed to make sure our app is installed before Django registration.
Adam changed the app load order in 69f709eb, but I talked to him and
said it was most likely ok (and more correct) to switch it back.

Fixes #710
Remove default activation templates

These are overridden in the management application so these stale,
unstyled overrides were only causing confusion.
Merge pull request #730 from jwalgran/topic/style-password-reset

Style password reset