Live stdout and stderr feed

[mxmrlv]

First of all thanks on the great library, we use it constantly. However i feld that i could really use some live feed of stdout and stderr from the local machine; So I've added some really basic support for writing into streams. This enables to pipe the stdour and stderr into some stream (providied by the user). Note this is works only when the response isn't in xml format (as xml stream needs to be decoded).

Pull request submitted.

[cloneluke]

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