Check for the phpunit command in a more efficient way
Check for the phpunit command in a more efficient way

akatakritos/guard-phpunit2,Maher4Ever/guard-phpunit,liuggio/guard-phpunit-sf2,guard/guard-phpunit,ramon/guard-phpunit2,liuggio/guard-phpunit-sf2,ramon/guard-phpunit2,akatakritos/guard-phpunit2,id90t/guard-phpunit2,guard/guard-phpunit,id90t/guard-phpunit2,liuggio/guard-phpunit-sf2,Maher4Ever/guard-phpunit