Add gitignore to list of ignored files

[vyasr]

I didn't add a test, but would be happy to do so. The reason I waited is that it seems like the easiest option would be to add the file to one of the existing tests/packages examples, but that would require modifying the hashes and I wasn't sure if that would be the preferred result.

Partially addresses #437, but only for the special case of gitignore. This doesn't fix the more general case of hidden files.

[henryiii]

I think it's important to keep the .gitignore(s) in the SDist - it should only excluded from wheels. Maybe we should have some better defaults, and some control over the defaults. I've got an idea, and will try to get back on this in a bit (in the middle of four conferences in three weeks!).

The key problem in #437 would be fixed by fixing the logic for files that start with a dot, which are not valid packages so should be skipped.

[vyasr]

I'll close this for now since I agree that it doesn't seem like the right fix. Happy to reopen if anything changes or to help work on an alternative fix later.

[henryiii]

Does the current version (0.4.8) work, by the way? It should be "fixed" (probably still coping the .gitignore's to the package, which still needs fixing, but the editable installs should no longer be broken).

[vyasr]

I hadn't seen the latest release, thanks for the update. Yes, I just tested and the build no longer fails. I'm not sure what behavior you are hoping to see for gitignores to call the issue truly resolved, but it sounds like you want to fix the set of files that get included and have them be different for wheels and sdists. Happy to discuss if you need any further help/input there.