Checkin for org mode

Now creates files under org/<date>.org. No longer a need to have many
daily todo files with a today symlink. There may be no need for more than a
single file in the end.
Removed undo-tree from emacs

Wasn't using it.
Shorter alias for emacs

Now `e`.
Removed evil leader, leader working

Evil leader could very simply be replaced by bindings such as

  (define-key evil-normal-state-map " s" 'save-buffer)

in .emacs.