Set emacs auto-fill minor mode to activate in all major modes.

This helps so that in any text file, emacs will automatically wrap lines after
the column-fill default (currently set to 80) instead of constantly having to
press M-q to manually fill it.
Merge branch 'master' of https://github.com/jenkinz/dotfiles

* 'master' of https://github.com/jenkinz/dotfiles:
  Modified offlineimaprc; rearranged folders