add Ctrl-P options to ignore certain directories
Squashed 'bundle/vim-vinegar/' content from commit 5b5fe4b

git-subtree-dir: bundle/vim-vinegar
git-subtree-split: 5b5fe4bb1f992bf6172122d9a4ee74417ab5904e
Merge commit '1a10dddc674b7e0e54cc3c5843891ddbb2c5d24e' as 'bundle/vim-vinegar'