Consider dropping import path support

[bradleyfalzon]

It's not possible to determine ahead of time which VCS path for a given import path without adding more code.

It maybe simpler to not support checking import paths, and instead, only check the local directory and it's sub directories.

[dmitshur]

Are you familiar with vcs.RepoRootForImportPath?

[bradleyfalzon]

I had trolled those repos looking for libraries to use/read, I can't recall why I didn't use them, will reinvestigate. But thanks for the reminder, I think it maybe useful in another related project.

No we're good on this one, give me a couple hours

[bradleyfalzon]

TODO needs additional tests (see some discussion in #31, but mostly lack of coverage in new commits.