title: heroku does a GET request when it should do a DELETE request
body: <p>When I click "Signout" in my app, Heroku performs a GET request against the URL when it should do a DELETE request.  When I click "Signout" in my local dev environment, it signs me out.</p>
  
  <pre><code>user-users-macbook-air:app user$ heroku run rake routes
             root        /                         home#show
        users GET    /users(.:format)          users#index
              POST   /users(.:format)          users#create
     new_user GET    /users/new(.:format)      users#new
    edit_user GET    /users/:id/edit(.:format) users#edit
         user GET    /users/:id(.:format)      users#show
              PUT    /users/:id(.:format)      users#update
              DELETE /users/:id(.:format)      users#destroy
     sessions POST   /sessions(.:format)       sessions#create
  new_session GET    /sessions/new(.:format)   sessions#new
      session DELETE /sessions/:id(.:format)   sessions#destroy
       signup        /signup(.:format)         users#new
       signin        /signin(.:format)         sessions#new
      signout DELETE /signout(.:format)        sessions#destroy
  </code></pre>
  
  <p>After clicking the Signout link in my app:</p>
  
  <pre><code>user-users-macbook-air:app user$ heroku logs
  2012-07-10T00:55:13+00:00 app[web.1]: Started GET "/signout" for 128.36.168.39 at 2012-07-10 00:55:13 +0000
  2012-07-10T00:55:13+00:00 app[web.1]: 
  2012-07-10T00:55:13+00:00 app[web.1]: ActionController::RoutingError (No route matches [GET] "/signout"):
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.6/lib/action_dispatch/middleware/debug_exceptions.rb:21:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.6/lib/rails/rack/logger.rb:26:in `call_app'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.6/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.6/lib/rails/rack/logger.rb:16:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/methodoverride.rb:21:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/runtime.rb:17:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.6/lib/action_dispatch/middleware/request_id.rb:22:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/lock.rb:15:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.6/lib/action_dispatch/middleware/static.rb:62:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.6/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-ssl-1.3.2/lib/rack/ssl.rb:27:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:245:in `fetch'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:136:in `forward'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:185:in `lookup'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:66:in `call!'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.6/lib/rails/application.rb:220:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:51:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.6/lib/rails/engine.rb:479:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/content_length.rb:14:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.6/lib/rails/rack/log_tailer.rb:17:in `call'
  2012-07-10T00:55:13+00:00 app[web.1]:   /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
  2012-07-10T00:55:13+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/handler/webrick.rb:59:in `service'
  2012-07-10T00:55:13+00:00 app[web.1]:   /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
  2012-07-10T00:55:13+00:00 app[web.1]: 
  2012-07-10T00:55:13+00:00 app[web.1]: 
  2012-07-10T00:55:13+00:00 app[web.1]:   /usr/local/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'
  2012-07-10T00:55:13+00:00 heroku[router]: GET glassboard.herokuapp.com/signout dyno=web.1 queue=0 wait=0ms service=9ms status=404 bytes=728
  </code></pre>