.muttrc: remove executable bit
emacs: bind C-x v to magit-status, as before

869f8 (.emacs: clean up custom keybindings, 2013-02-10) removed the
keybinding for magit-status while cleaning up keybindings by mistake.
Re-add it.
.emacs: remove quack

What is quack anyway?
.zshrc: include /usr/sbin, /sbin in PATH