Squashed 'bundle/ack.vim/' content from commit 303bcef

git-subtree-dir: bundle/ack.vim
git-subtree-split: 303bceff1c8ab1145d114083582b1aeac9de7a85
Merge commit '4213cc68bcdd2d96470be8e178053c408d5187da' as 'bundle/ack.vim'
delete ack.vim