use cperlbug to add github issue

[rurban]

Convert perlbug to cperlbug, which files issues on github.
We don't need to send email, just post a web request with some simple json.
But we need the github username, or some administrative name with its token.
Already started with that.

[chorny]

A couple of notes:

1. github API needs SSL
2. if report is about module, it checks Module::CoreList