made activitystreams2.owl pass turtle-validator

[elf-pavlik]

noticed in #65
validated with https://github.com/mmlab/TurtleValidator

[elf-pavlik]

@jasnell do you see any problem with merging this one? i share links to this file which according to validator currently has invalid turtle 😞

you may also like to check out this small nuance in turtle rdfjs/N3.js#30 (comment)

[elf-pavlik]

@RubenVerborgh would you say with confidence that we can rely on this turtle-validator?
I mostly would like to double check that blank nodes shouldn't use . before closing square bracket. Most errors came from that so also most of my edits just remove this .

[RubenVerborgh]

I actually didn't know about this validator, even though it's written by the guy next to me 😄

That said, yes you can rely on this, as N3.js passes all Turtle spec-compliance tests and is battle-tested.
I upgraded to the latest N3.js version, which includes several bugfixes.

[RubenVerborgh]

And here's a patch to N3.js in case your blank nodes are really broken (using a . inside of them and omitting a closing bracket ]).