add devise and bundle update
get translation test running
rails g devise:install + switch to username
rails g devise user
migrate wobauth_users
user is now integrated in wobauth(::user)
extract user logic to concerns

  as described in http://guides.rubyonrails.org/engines.html#overriding-models-and-controllers
more devise to engine stuff
cleanup user_class, not longer used
add eager loading for concerns
rebuild namespace, don't work otherwise
change models to respect now included user

  adaptions to be made after migration from app given user
  model to included wobauth::user
drop devise user migration within dummy tes
require devise -> engine.rb
overwrite sign_up path_for for use in engine
adapt devise views to bootstrap
remove duplicate autofocus
bootstrap variant of reg/edit
use class=container
add a dummy login path for later single sign on