Minor ubuntu sudoers tweaks.
Update stale links in README.
vim/mvim is now the default editor, other vim tweaks.
Lots of little vim tweaks, many courtesy @gf3.
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Lots of little vim tweaks, many courtesy @gf3.
  vim/mvim is now the default editor, other vim tweaks.
  Update stale links in README.
  Minor ubuntu sudoers tweaks.