Pedantic mode

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Working with @fbacall we found various issues with @id and identifier. Some of the examples were outdated.

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editor call with @ptsefton 2019-11-08:

Agreed that ./foo should be foo

Still to be investigated foo/ vs foo for directories. Calcyte uses foo.

Blank nodes ARE permitted, modify "MUST URI" to "SHOULD URI". # ones are OK, but also permit _: ones as MAY. # example changes OK. Not too important that ro-crate-metadata.jsonld#tim != ro-crate-preview.html#tim as it's still better than blank nodes which are always different.

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OK, so the remaining contentious part here is directories should end in / or not and if we should say something about it. I'll raised that as new issue.