Squashed 'bundle/vim-signify/' content from commit be2d729

git-subtree-dir: bundle/vim-signify
git-subtree-split: be2d7290ca90caee59e4518c96c5c5ca85e5e0b1
Merge commit 'caa62dba49cb2598122af8d9860d1b240f2d0c71' as 'bundle/vim-signify'