Refactored _check_version method in WPSRequest.
Refactored _check_version method in WPSRequest.

jonas-eberle/pywps,bird-house/PyWPS,jachym/PyWPS,SiggyF/pywps-4,tomkralidis/pywps,ricardogsilva/PyWPS,geopython/pywps,ldesousa/PyWPS