Re: [webcomponents] [Custom]: "are" custom element names ASCII characters, or MUST they be ASCII characters? (#239)

The previous discussion was in a [Mismatch between HTML parser and createElement() et al](https://groups.google.com/a/chromium.org/d/msg/blink-dev/YyqxpIPU-0E/dXg0JBRVBwAJ) thread on blink-dev, spawned from a [Inconsistency in characters allowed in attribute names between setAttribute and HTML syntax specs](https://www.w3.org/Bugs/Public/show_bug.cgi?id=27228) spec bug.

ASCII alpha + ASCII hyphen seems like the safer option, really.

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https://github.com/w3c/webcomponents/issues/239#issuecomment-191746920