 
   (add-to-list 'auto-mode-alist '("\\.gemspec\\'" . ruby-mode))
   (add-to-list 'auto-mode-alist '("/config\\.ru\\'" . ruby-mode))
-  (add-to-list 'auto-mode-alist '("\\(Gem\\|Thor\\|Berks\\|Vagrant\\)file\\'" . ruby-mode))
+  (add-to-list 'auto-mode-alist '("\\(Rake\\|Gem\\|Thor\\|Berks\\|Vagrant\\)file\\'" . ruby-mode))
+  (add-to-list 'auto-mode-alist '("\\.builder\\'" . ruby-mode))
 
   (eval-after-load "ruby-mode"
     '(let nil

;; gude-key
(when (kui/package-require 'guide-key nil nil t)
  (setq
   guide-key/guide-key-sequence '("M-t" "C-c" "C-x RET" "C-x C-h" "C-x r" "M-m")
   guide-key/popup-window-position 'bottom
   guide-key/polling-time 0.5
   guide-key/popup-if-super-key-sequence t

   )
  (set 'popwin:special-display-config
       (append
        '(("*helm imenu*" :position :right)
          ("*Buffer List*" :position :bottom :height 20 :dedicated t :tail t)
          )
        popwin:special-display-config))
  )
