Squashed 'bundle/vim-fugitive/' changes from 90ee6fb..0374322

0374322 Fix :Glog

git-subtree-dir: bundle/vim-fugitive
git-subtree-split: 0374322ba5d85ae44dd9dc44ef31ca015a59097e
Merge commit 'f56a5c6a74d6043794c55238fb7f67aedc4b78c9'