[zendframework/zf2#3241] Minor logic cleanup
[zendframework/zf2#3241] Minor logic cleanup

- Cleaned up logic in ParameterReflection::getType() to better pair return
  values with conditions that cause them.

basz/zend-code,remicollet/zend-code,DaanBiesterbos/zend-code,zendframework/zend-code,Ocramius/zend-code,MadCat34/zend-code