Github token without repo:public_repo OAuth scope causes 404 for loader files only

[webxl]

The cache makes this a bit hard to test, so rm -rf ~/.jspm/loader-files/systemjs before testing.

First off, I think the config command gives false positives. This was using a key without repo:public_repo:

$ jspm registry config github
Would you like to set up your GitHub credentials? [yes]:
     If using two-factor authentication or to avoid using your password you can generate an access token at https://github.com/settings/tokens. Ensure it has public_repo scope access.

Enter your GitHub username:webxl
Enter your GitHub password or access token:
Would you like to test these credentials? [yes]:
ok   GitHub authentication is working successfully.
ok   Registry github configured successfully.

I think it also was successful putting in garbage credentials, but something could have been cached in my config I suppose. But whenever the loader files are needed, it chokes with 404:

$ jspm init

ok   Verified package.json at package.json
     Verified config file at config.js
     Looking up loader files...

warn Error on download for github:systemjs/systemjs
     Bad response code 404

err

err  Error downloading loader files.

err

Originally I got this by running jspm install against this project: https://github.com/css-modules/jspm-demo. It was able to load dependencies from github, so I think this scope might only be required when the loader files are needed.

Also, it would be great if the error message contained info about the repo:public_repo scope.

Using jspm v0.16.49