New modules should use the ZF\Apigility\Autoloader

- instead of the Zend\Loader\StandardAutoloader implementation, as it
  allows underscores in both namespaces and class names.
Use ZF\Apigility\Autoloader

- instead of StandardAutoloader
Merge branch 'feature/use-psr-4-autoloader-for-new-apis'

Updates module creation to use the ZF\Apigility\Autoloader instead of the
Zend\Loader\StandardAutoloader.