Confusing $isFault in Client

[piotrooo]

Why Client class has logic responsible for throwing exception when server return fault? It's little confusing for me, this is not responsibility of this class.

For me this exception should be thrown by parsers. And passing by reference could be removed.

For class NativeParser line could be changed for:

throw ResponseException::fault($result);

For class XmlReaderParser line could be set as internal variable and after all parsed document checked is fault was encountered and then throw exception.

[lstrojny]

Sounds like a good refactoring, agreed.

[piotrooo]

merged #57