Specify a custom-file and add it to gitignore

This is to make customize variables not go in init.el

.emacs.d/.gitignore

@@ -5,4 +5,5 @@
 /tramp
 /smex-items
 /url
-.yas-compiled-snippets.el
+.yas-compiled-snippets.el
+/custom.el

.emacs.d/init.el

@@ -12,7 +12,8 @@
 (setq compilation-scroll-output 1
       read-file-name-completion-ignore-case t
       inhibit-startup-screen t
-      vc-follow-symlinks t)
+      vc-follow-symlinks t
+	  custom-file "custom.el")
 (load-theme 'fred t)
 (savehist-mode 1)
 (show-paren-mode 1)