Squashed '.vim/bundle/nerdtree/' content from commit b0bb781

git-subtree-dir: .vim/bundle/nerdtree
git-subtree-split: b0bb781fc73ef40365e4c996a16f04368d64fc9d
Merge commit 'b7e9278aabcdfcfaa25748f096e3c988edbe6e67' as '.vim/bundle/nerdtree'
[vim] shortcut to activate nerdtree ,d