add ntp to berks dependencies

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
bugfix: installation of berkshelf on ubuntu

install libgecode separately and make sure to ignore doc errors

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
bugfix: basic user action cannot be unlock

unlock is only valid if the user exists; just create all users with their default action

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>