Detect repo url from file / directory. Or allow to pull only part of a repo.

[markperri]

Proposed change

I have some users who try to pull one file or a directory from a repo. This doesn't work and just gives ValueError: Problem accessing HEAD branch. It would be nice if the nbpuller could derive the repo url from the file or directory and pull the entire repo.

Alternative options

It would be even better if it would just pull the file / directory requested, but I don't know how it would reconcile with further requests without a .git directory.

Who would use this feature?

Users who are unfamiliar with git and try to use it like Google Drive.

(Optional): Suggest a solution

I don't know if github provides an api to get the repo url from a file, but I suppose just deleting paths from right to left and adding .git then trying to clone it would be a brute force way.

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