Squashed '.vim/bundle/vim-signify/' content from commit 52e7f79

git-subtree-dir: .vim/bundle/vim-signify
git-subtree-split: 52e7f7902d2a74697942d08d6b1f25485777d710
Merge commit '2291a5f9a46ceff6ed0c43e653aa6889a6e2d47c' as '.vim/bundle/vim-signify'
set background to black for signify marks
remove trailing spaces from all files