Feature: Support uploading a complete directory / existing repo with "gist ." or "gist somedir"

[zachriggle]

Thanks for creating the gist tool! It took me a few minutes to set up because I'm using it with GHE (and I created ~/.gist instead of ~/.gist.https.xxx.corpsite.com).

One thing that would be nice is the ability to upload an entire directory (which may be an existing Git repository) to the Gist site.

I know there are caveats to this (namely, that folders are unsupported) and there may be limits to the API, but it would be nice to be able to at LEAST blanket upload all files in a provided directory, e.g. gist ..

I understand this is functionally equivalent to gist * or gist dir/*, but it would be nice to be automatic.