remove old vim-surround
Squashed '.vim/bundle/vim-surround/' content from commit 42e9b46

git-subtree-dir: .vim/bundle/vim-surround
git-subtree-split: 42e9b46e7a20a2f394664874c7bbd9d6f6c39e8a
Merge commit '25be20c07e298fb794c7e6493ed9e1d0d5a08872' as '.vim/bundle/vim-surround'
adding subtree info for vim-surround
updating doc tags
allow use of "s" for surround in visual mode