Issue #1916936 by msonnabaum: Add vendored copy of phpunit.

...deCoverage/Report/HTML/Renderer/Template/js/highcharts.js

...odeCoverage/Report/HTML/Renderer/Template/js/html5shiv.js

...deCoverage/Report/HTML/Renderer/Template/js/jquery.min.js

...erage/Report/HTML/Renderer/Template/method_item.html.dist

...hpunit/php-code-coverage/PHP/CodeCoverage/Report/Node.php

...-code-coverage/PHP/CodeCoverage/Report/Node/Directory.php

...t/php-code-coverage/PHP/CodeCoverage/Report/Node/File.php

...p-code-coverage/PHP/CodeCoverage/Report/Node/Iterator.php

...phpunit/php-code-coverage/PHP/CodeCoverage/Report/PHP.php

...hpunit/php-code-coverage/PHP/CodeCoverage/Report/Text.php

...endor/phpunit/php-code-coverage/PHP/CodeCoverage/Util.php

...-coverage/PHP/CodeCoverage/Util/InvalidArgumentHelper.php

...or/phpunit/php-code-coverage/PHP/CodeCoverage/Version.php

core/vendor/phpunit/php-code-coverage/README.markdown

...t/php-code-coverage/Tests/PHP/CodeCoverage/FilterTest.php

...ode-coverage/Tests/PHP/CodeCoverage/Report/CloverTest.php

...de-coverage/Tests/PHP/CodeCoverage/Report/FactoryTest.php

...nit/php-code-coverage/Tests/PHP/CodeCoverage/UtilTest.php

.../phpunit/php-code-coverage/Tests/PHP/CodeCoverageTest.php

core/vendor/phpunit/php-code-coverage/Tests/TestCase.php