Method error in signout process

[ybur-yug]

To reproduce:

• clone repo

• cd ruby-science/example_app

• bundle && bundle exec rake db:migrate && bundle exec rails server

• navigate to main page, create account, sign in, create survey

• view surveys

• click signout
  Error Produced:

  Routing Error
  No route matches [GET] "/sign_out"
  Try running rake routes for more information on available routes.
  

Running rake routes gets:

         sign_out DELETE /sign_out(.:format)                             clearance/sessions#destroy

for this instance,
and if we grep out sign_out (the path that would be used for this) out....

    ➜  example_app git:(master) grep -r sign_out *
    app/views/shared/_header.html.erb:  <%= link_to 'Sign out', sign_out_path, method: :delete %>

As you can see, you use the delete method so I don't know what is causing the error, and have not had time to truly debug it.