Updated mediawiki/extensions
Project: mediawiki/extensions/Validator  88c4a9593832f843527241f7d69b21234aacef42

Imrpovements to the test setup

* Consistency fixes to the namespace usage
* Test loader and bootstrap file
* Test xml config
* TravisCI yaml config
* Improvements to class loading

Change-Id: I4d76ffcaaba32234a4b70c46b59dc69f21b75f09