Update Devise paths to be at /users instead of /auth_users

Been bothering me for a bit, and now I'm about to submit my official
redirect URL to the Neopets eng team so, let's polish this up!

config/environments/development.rb

@@ -125,5 +125,5 @@ Rails.application.configure do
 
   # Set the NeoPass redirect callback URL.
   config.neopass_redirect_uri =
-    "http://localhost:3000/auth_users/auth/neopass/callback"
+    "http://localhost:3000/users/auth/neopass/callback"
 end

config/environments/production.rb

@@ -144,5 +144,5 @@ Rails.application.configure do
 
   # Set the NeoPass redirect callback URL.
   config.neopass_redirect_uri =
-    "https://impress.openneo.net/auth_users/auth/neopass/callback"
+    "https://impress.openneo.net/users/auth/neopass/callback"
 end

config/environments/test.rb

@@ -80,5 +80,5 @@ Rails.application.configure do
 
   # Set the NeoPass redirect callback URL.
   config.neopass_redirect_uri =
-    "http://localhost:3000/auth_users/auth/neopass/callback"
+    "http://localhost:3000/users/auth/neopass/callback"
 end

config/routes.rb

@@ -2,7 +2,7 @@ OpenneoImpressItems::Application.routes.draw do
   root :to => 'outfits#new'
 
   # Login and account management!
-  devise_for :auth_users
+  devise_for :auth_users, path: "users"
 
   # The outfit editor!
   # TODO: It's a bit silly that outfits/new points to outfits#edit.