allow unicode names

[futurist]

According to the spec, unicode can be appeared in names, but below check prevent that

https://github.com/holidayextras/jsonapi-server/blob/master/lib/jsonApi.js#L57

The unicode world need this feature, could add unicode support?

[theninj4]

The spec says:

The following “globally allowed characters” MAY be used anywhere in a member name:
...
U+0080 and above (non-ASCII Unicode characters; not recommended, not URL safe)

So whilst they're not recommended, we could have a config setting that enables engineers to opt-in to say "Yes, these characters aren't URL safe, but I have no choice" and therefore loosen our validation regexp's.

I wonder how things like Swagger and GraphQL deal with unicode characters...