Don't use static error pages

* app/controllers/errors_controller.rb: New controller for the various
  error pages.

* app/views/errors/internal_server_error.html.erb: New page for when
  errors occur.

* config/application.rb:
* config/routes.rb: Specify that we're using our own routes for
  errors.

* public/404.html:
* public/500.html: Remove static error pages.

Author: scottjones

app/controllers/errors_controller.rb

@@ -0,0 +1,13 @@
+class ErrorsController < ApplicationController
+  def internal_server_error
+    render(status: :internal_server_error)
+  end
+
+  def not_found
+    render(status: :not_found)
+  end
+
+  def unauthorized
+    render(status: :unauthorized)
+  end
+end

app/views/errors/internal_server_error.html.erb

@@ -0,0 +1,5 @@
+<div class="alert alert-danger">
+  An error occurred because something went wrong.  Please try again.
+</div>
+
+<%= link_to "Main Page", grants_path, class: "btn btn-primary" %>

config/application.rb

@@ -36,5 +36,6 @@ class Application < Rails::Application
       require "environment_setup"
       EnvironmentSetup.check_setup
     end
+    config.exceptions_app = routes
   end
 end

config/routes.rb

@@ -22,5 +22,12 @@
     resources :forms
   end
 
+  match "/401", to: "errors#unauthorized", via: :all
+  match "/404", to: "errors#not_found", via: :all
+  match "/500", to: "errors#internal_server_error", via: :all
+  get 'errors/internal_server_error'
+  get 'errors/not_found'
+  get 'errors/unauthorized'
+
   root 'grants#index'
 end