(spotted in #102)

The PHP implementation used to look at the compatibility-kit folder to get the ndjson example files.

Because of the way this was implemented, a non-existent folder = no source data = skipped tests :/

The Ruby version also uses the CCK to test, but it looks like CCK is published as a bundle and data's sourced from there - the PHP implementation should explicitly download the CCK data and use it for the tests.