Unify serialization and stream adapters

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Currently, StreamAdapters include a "formatter" that knows how to convert 
stream bytes to json. The formatter is currently a StreamToJson converter. 
We should change this so that we re-use the serialization framework-- it 
makes little sense to have to api's that basically handle the same task.

Original issue reported on code.google.com by [e-mail] on 23 Sep 2009 at 12:53