Various minor updates:
- Long usernames are handled better for seats now.
- html5shiv added for < IE9.
- Fixed a spelling mistake.
- Touched up on the profile-edit page a bit with regards to the only-update-password-if-you-want-to message.
Updated redirects after various user actions.
Moved User-model to the new Model-superclass.
- Password is now truly private for web-users.
Added another button for submitting seat-choice.
Made the facebook link open in a new tab.