Remove web-mode customization

- Code indent offset is subjected to personal taste, I think we should
  stick to the web-mode default, which is sensible enough, and leave it
  to the user to decide.
- `web-mode-disable-autocompletion` is no longer used by web-mode.
- As to `newline-and-indent`, I think we should be consistent across all
  major modes. And this line of code will become useless with Emacs 24.4.

modules/prelude-web.el

@@ -49,12 +49,7 @@
 (eval-after-load 'web-mode
   '(progn
      (defun prelude-web-mode-defaults ()
-       ;; Customizations
-       (setq web-mode-markup-indent-offset 4)
-       (setq web-mode-css-indent-offset 2)
-       (setq web-mode-code-indent-offset 4)
-       (setq web-mode-disable-autocompletion t)
-       (local-set-key (kbd "RET") 'newline-and-indent))
+       )
      (setq prelude-web-mode-hook 'prelude-web-mode-defaults)
 
      (add-hook 'web-mode-hook (lambda ()