Change boostrap.php to not have to copy config.php when running stock tests
Make Intl and XSL optional in composer.json to be able to run on HHVM
Enable hhvm testing in .travis.yml
Bump Doctrine DBAL to 2.5.*@beta to get HHVM supported version
[travis] Reduce number of builds for hhvm testing
Add PHPunit debugging to find the cause of the current unittest fatal
Change ConfigurationTest to mock class instead of interface

As interface declares __construct which does not work with hhvm