Fix rprompt
Move magit from C-x C-g to C-x g

I hit C-g out of habit to cancel a command. With the old binding, this
would bring up magit if I started a C-x command.
Use ibuffer to list buffers
Ignore node_modules folders in ack
Use ocp-indent for OCaml code if installed
Revert "Jedi: smart Python autocompletion"

As it turns out, Jedi doesn't really work for very large codebases
where it would be the most useful.

This reverts commit 5597844cc7733fc77e0b5de257723d77f0488301.
Make org-mode export nicer
Emacs GUI cleanup