Fix sudo-edit function

When using (interactive "p") arg is turn into value 1 when arg is nil
and therefore condition in if form is always true. With raw
version, (interactive "P"), arg remains nil if nil.
add apropos buffer to popwin controlled list
update dependencies
Merge pull request #100 from ptrv/fix-sudo-edit-fn

Fix sudo-edit function
Merge branch 'master' of https://github.com/overtone/emacs-live
Load git-gutter-conf but disable global-git-gutter-mode