PhpUnit test execution options

Thanks to @jackwh you can now pass in phpunit execution options.

--stop-on-error       : Stop execution upon first error
--stop-on-failure     : Stop execution upon first error or failure
--stop-on-warning     : Stop execution upon first warning
--stop-on-risky       : Stop execution upon first risky test
--stop-on-skipped     : Stop execution upon first skipped test
--stop-on-incomplete  : Stop execution upon first incomplete test
--fail-on-warning     : Treat tests with warnings as failures
--fail-on-risky       : Treat risky tests as failures