[#104] Add emacs-dirtree to ome-experimental module.
[#117] Remove dump boxes around the arrows for powerline.

I've got this via simple hack by `defadvice`.

Thanks @mszegedy.
Add `dired` command to evil-leader's shortcuts by `SPC d`.
Add a switch between "Mac" keys and "PC" keys.
Bind `SPC z` to `repeat`.
Trying to fix my stupidness.