remove whinny rails config since it is deprecated

    DEPRECATION WARNING: config.whiny_nils option is deprecated and no longer works. (called from block in <top (required)> at rubygems.org/config/environments/development.rb:3)
change the sign_out route name in order to not conflict with clearance's named routes

there is an open rails/rails issue related to this:
https://github.com/rails/rails/issues/11895

i think this is the best solution for the time being.
translate has_many's order syntax to rails4 compliant syntax