Issue #2400407 by klausi: Update PHPUnit to latest version.

core/composer.json

core/composer.lock

core/vendor/composer/autoload_classmap.php

core/vendor/composer/include_paths.php

core/vendor/composer/installed.json

core/vendor/phpunit/php-code-coverage/.travis.yml

core/vendor/phpunit/php-code-coverage/ChangeLog-2.2.md

core/vendor/phpunit/php-code-coverage/composer.json

core/vendor/phpunit/php-code-coverage/src/CodeCoverage.php

...dor/phpunit/php-code-coverage/src/CodeCoverage/Driver.php

...hpunit/php-code-coverage/src/CodeCoverage/Driver/HHVM.php

...unit/php-code-coverage/src/CodeCoverage/Driver/PHPDBG.php

...unit/php-code-coverage/src/CodeCoverage/Driver/Xdebug.php

.../phpunit/php-code-coverage/src/CodeCoverage/Exception.php

...src/CodeCoverage/Exception/UnintentionallyCoveredCode.php

...dor/phpunit/php-code-coverage/src/CodeCoverage/Filter.php

...unit/php-code-coverage/src/CodeCoverage/Report/Clover.php

...unit/php-code-coverage/src/CodeCoverage/Report/Crap4j.php

...nit/php-code-coverage/src/CodeCoverage/Report/Factory.php

...hpunit/php-code-coverage/src/CodeCoverage/Report/HTML.php