PHP Solid Server now passes all three Solid test suites \o/

Hi all,

A small but happy announcement from the PDS Interop team just before
Christmas - thanks to the hard work by Yvo Brevoort, Ben Peachey and Auke
van Slooten, and with kind help from Pete Edwards and others, the PHP Solid
Server now passes all tests in all Solid test suites:

   - WebID Provider <https://github.com/solid/webid-provider-tests>: 36 out
   of 36
   <https://travis-ci.com/github/pdsinterop/php-solid-server/builds/210064326#L2142>
   - Solid CRUD <https://github.com/solid/solid-crud-tests>: 61 out of 61
   <https://travis-ci.com/github/pdsinterop/php-solid-server/builds/210064326#L2160>
   - Web Access Control <https://github.com/solid/web-access-control-tests>
   : 67 out of 67
   <https://travis-ci.com/github/pdsinterop/php-solid-server/builds/210064326#L2326>

This is a big step towards Solid's goal of *making every app compatible
with every pod*.

Hurray for all your hard work! And a merry Christmas to all :)


Cheers,
Michiel.