Only load test suite classes in dev
Only load test suite classes in dev

Updated the composer file to only load the test suite classes when in dev
hiromi2424/CakePHP3-Proffer,srubengt/CakePHP3-Proffer,davidyell/CakePHP3-Proffer,Kamoris/CakePHP3-Proffer,TituxMetal/CakePHP3-Proffer