Re: [whatwg/url] Document, possibly standardize, "plus" scheme convention (#230)

Talk about a quick response! This isn't so much about the protocol itself, it's actually very URL-intrinsic.

So here's where this comes up. As you know, URLs with a scheme that uses a network location get a '//' whereas those without do not. `http://github.com` vs `mailto:mahmoud@hatnote.com`. 

If the standard is enforced strictly, and the scheme is treated as a whole, it's not possible to guess if a scheme implies the URL has a network location. So we don't know whether it should be `git+ftp://...` or `git+ftp:...`, despite the fact that you or I can clearly guess.

A manifestation of this can be seen in Python's built-in URL support, here: https://hg.python.org/cpython/file/2.7/Lib/urlparse.py#l41

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