Return files relative to git directory

[patrick91]

It was returning files relative to the current working directory, not the git one.

Should also fix #118

[patrick91]

@rodneyrehm can you have a look at this? I just had a look at the failing test, and I'm not sure if what I have done is correct :)

[rodneyrehm]

Maybe it's time to clean up with the directory mess?

I've been trying a few things and it's it turns out that paths used for filtering should be relative to the git root, while paths provided to the linters should be absolute, so that we don't run into issues with different working directories. Give me a minute to patch this up…

Also I believe the matchBase option, currently enabled on minimatch, should be removed in order to allow specific filtering. But that would be a breaking change, as *.js would then only find JavaScript files at the root of the git directory. Users would have to correct their patterns to use **/*.js instead.

[okonet]

Why do you need to remove matchBase? If it isn't absolutely necessary I'd like to keep it to simplify configuration. Generally we're only interested in file extensions most of the time.

[rodneyrehm]

With that option set it is impossible to match only files at the root level. I don't have this issue myself, it's just something I noticed while tinkering with your setup.

[okonet]

I believe no one expressed such a problem before so I'm for the simplicity of the config.