Add an AdminController base class for Admin controllers

Handles stuff that's shared across admin controllers.

app/controllers/admin/dashboard_controller.rb

-class Admin::DashboardController < ApplicationController
-  layout "admin"
-  before_filter :authenticate_user!
-  before_filter :authenticate_admin!
-
+class Admin::DashboardController < AdminController
   def index
     @workers = Resque.workers
     @pending_jobs = Resque.size(:post_receive)

app/controllers/admin/hooks_controller.rb

-class Admin::HooksController < ApplicationController
-  layout "admin"
-  before_filter :authenticate_user!
-  before_filter :authenticate_admin!
-  
+class Admin::HooksController < AdminController
   def index
     @hooks = SystemHook.all
     @hook = SystemHook.new

app/controllers/admin/logs_controller.rb

-class Admin::LogsController < ApplicationController
-  layout "admin"
-  before_filter :authenticate_user!
-  before_filter :authenticate_admin!
+class Admin::LogsController < AdminController
 end
-

app/controllers/admin/projects_controller.rb

-class Admin::ProjectsController < ApplicationController
-  layout "admin"
-  before_filter :authenticate_user!
-  before_filter :authenticate_admin!
+class Admin::ProjectsController < AdminController
   before_filter :admin_project, only: [:edit, :show, :update, :destroy, :team_update]
 
   def index

app/controllers/admin/resque_controller.rb

-class Admin::ResqueController < ApplicationController
-  layout 'admin'
+class Admin::ResqueController < AdminController
   def show
   end
 end

app/controllers/admin/team_members_controller.rb

-class Admin::TeamMembersController < ApplicationController
-  layout "admin"
-  before_filter :authenticate_user!
-  before_filter :authenticate_admin!
-
+class Admin::TeamMembersController < AdminController
   def edit
     @admin_team_member = UsersProject.find(params[:id])
   end

app/controllers/admin/users_controller.rb

-class Admin::UsersController < ApplicationController
-  layout "admin"
-  before_filter :authenticate_user!
-  before_filter :authenticate_admin!
-
+class Admin::UsersController < AdminController
   def index
     @admin_users = User.scoped
     @admin_users = @admin_users.filter(params[:filter])

app/controllers/admin_controller.rb

+# Provides a base class for Admin controllers to subclass
+#
+# Automatically sets the layout and ensures an administrator is logged in
+class AdminController < ApplicationController
+  layout 'admin'
+  before_filter :authenticate_admin!
+
+  def authenticate_admin!
+    return render_404 unless current_user.is_admin?
+  end
+end

app/controllers/application_controller.rb

@@ -84,10 +84,6 @@ class ApplicationController < ActionController::Base
     abilities << Ability
   end
 
-  def authenticate_admin!
-    return render_404 unless current_user.is_admin?
-  end
-
   def authorize_project!(action)
     return access_denied! unless can?(current_user, action, project)
   end