Squashed 'vim/bundle/ack/' content from commit f183a34

git-subtree-dir: vim/bundle/ack
git-subtree-split: f183a345a0c10caed7684d07dabae33e007c7590
Merge commit 'd38047184ddff71a5c0e0203abb71713b324f345' as 'vim/bundle/ack'
Tweaks to zsh for nohup