Set guile as the default scheme implementation for geiser.

Otherwise, org-babel will always prompt for "Scheme implementation" when
you use org-mode with org-babel scheme support.

Author: xiaohanyu

modules/ome-scheme.org

@@ -51,6 +51,9 @@ still in beta version, however, and will be sent to el-get when stable.
 
 #+NAME: geiser
 #+BEGIN_SRC emacs-lisp
+  (defun ome-geiser-setup ()
+    (setq geiser-default-implementation 'guile))
+
   (defun ome-ac-geiser-setup ()
     (add-hook 'geiser-mode-hook 'ac-geiser-setup)
     (add-hook 'geiser-repl-mode-hook 'ac-geiser-setup)