getBlob returns unusable inputstream

[jottley]

The SObjectsTemplate.getBlob method returns an InputStream. The inputstream is an instance of EofSensorInputStream which only allows a single use before the stream is automatically closed.

We need to validate that how we are using it is causing the stream to be closed when we are returning the object. If that is the case we need to change how we are implementing the ResponseExtractor to not cause the stream to be closed.

[jottley]

#10 Changes to exchange from execute and then uses the ByteArrayMessageConverter to handle the response. The ByteArray is then passed to a ByteArrayInputStream to maintain the method signature.