Use katana forms auth module instead of custom one.
Added support for windows auth again.
Changed the cookie name to jabbr.id
Made some changes to auth.
- Changed AddUser to GetOrAddUser on IMembershipService.
- Implemented an IFederationAuthenticationProvider for jabbr's wsfed auth.
Normalize claims based login.
- Removed logic that converts social sign in to user and made
  it sign in with claims instead.
- Removed Membership logic from the JabbRFederationAuthenticationProvider.
Resolve the IFormsAuthenticationProvider
More changes to auth to unify things more.
- Add specific jabbr claim to id
- Made WindowsPrincipalHandler which is an active login for windows auth.
- Added callback to forms auth module for linking.
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Fix SignIn extension method that takes a user id.
Allow partial logins to be completed by adding more claims from user.
Detect the acs identity provider claim.
Fixed partial auth.
- Added GetUser by ClaimsPrincipal that gets the partially authenticated user from
  the principal.
- Redirect for extra claims on the main page.
- Move WindowsAuth before any other auth.
Fix windows auth with wsfed.
- If we're using windows auth then 302 before the wsfed module can run.
- Added new claim for partial identities so it doesn't happen for windows auth.
Re-added support for linking.
Fixed css
Fixed css again.