--probSpecsDir option: Cope with ssh-cloned repo

[glennj]

Repo cloned with ssh does not match github.com/exercism

$ cd ../problem-specifications/
$ git remote -v
origin	git@github.com:exercism/problem-specifications.git (fetch)
origin	git@github.com:exercism/problem-specifications.git (push)

[ee7]

Thanks.

We should update the doc comment (and probably the error message) to reflect that location no longer contains github.com, but otherwise I think this PR should be merged.

I'd like to improve the scanf pattern instead of using two contains, but I can do that in another PR. I see the possibilities as:

1. hardcode github.com (removing host as a parameter) or
2. pass host as a static string and then write something like:

  var remoteName, remoteUrl, x: string # `x` to ignore http(s)/git/www.
  for line in remotes.splitLines():
    if line.scanf(&"$s$w$s$+{host}$+(fetch)$.", remoteName, x, remoteUrl):
      if remoteUrl.continuesWith(location, start = 1): # ignore ':' and '/'
        return remoteName

[ErikSchierboom]

I've verified that it still works for HTTPS repos. The change looks looks to me. I'll wait for the approve of @ee7 to merge.

[ErikSchierboom]

Thanks @glennj!