update authentication system to Devise

config/environments/development.rb

@@ -1,6 +1,9 @@
 Thingspeak::Application.configure do
   # Settings specified here will take precedence over those in config/environment.rb
 
+  # required by devise
+  config.action_mailer.default_url_options = { :host => 'localhost:3000' }
+
   # In the development environment your application's code is reloaded on
   # every request.  This slows down response time but is perfect for development
   # since you don't have to restart the webserver when you make code changes.

config/environments/production.rb

@@ -1,6 +1,9 @@
 Thingspeak::Application.configure do
   # Settings specified here will take precedence over those in config/environment.rb
 
+  # required by devise
+  config.action_mailer.default_url_options = { :host => 'localhost:3000' }
+
   # The production environment is meant for finished, "live" apps.
   # Code is not reloaded between requests
   config.cache_classes = true
@@ -62,3 +65,4 @@ Thingspeak::Application.configure do
   config.assets.js_compressor  = :uglifier
   config.assets.css_compressor = :scss
 end
+

config/environments/test.rb

@@ -1,6 +1,9 @@
 Thingspeak::Application.configure do
   # Settings specified here will take precedence over those in config/environment.rb
 
+  # required by devise
+  config.action_mailer.default_url_options = { :host => 'localhost:3000' }
+
   # The test environment is used exclusively to run your application's
   # test suite.  You never need to work with it otherwise.  Remember that
   # your test database is "scratch space" for the test suite and is wiped