Creation of a registry for MagentoSoapClientParameters #166

Renamed MagentoSoapClientParameters_old during the modification
It will be deleted after.
Add default store view in parameters #166
Refactor MagentoItemStep to use Registry #166
Refactor NormalizerGueser to use registry #166
Refactor WebserviceGuesser to use registry #166
Refactor MagentoSoapClientFactory to use registry #166
IsValid is instantiate at null instead of false #166
DefaultStoreView is instantiate at SOAP_DEFAULT_STORE_VIEW #166
Update MagentoItemStep to use registry #166
Refactor mappers to use registry #166
Refactor merger to use registry #166
Refactor validator to use registry #166
Update MagentoSoapClient to use registry #166
Update UrlExplorer for registry #166
Update Registry #166