Unsupported format is not known

[pietercolpaert]

https://github.com/tdt/triples/blob/master/src/Tdt/Triples/Controllers/DataController.php#L33

E.g., http://triples.demo.thedatatank.com/test.thisdoesstillreturnjson

[coreation]

@pietercolpaert Actually this is the case in the core package as well. Json is the default format if an invalid one is given. Should this result in an error if something like this happens?

[coreation]

The content negotiation is fully dependent on the core application, which has received an update regarding content negotiation: tdt/core#121