updating rails to 3.2.18
Allow saving users without new-style-password.

Previously only records with a bcrypt-password present could be saved.
With this it's possible to save forward_destination and role without
setting a new password.
Use simple_form
Update bootstrap-sass
Fix bootstrap-foo and improve design.
Ignore sass-cache
Fix scripts.
Little simplification
Improve checkpassword-auth-script
A comment
Simple settings to disable the dyndns_hostnames-feature.