[Haskell-cafe] JSON parser that returns the rest of the string that was not used

[Ryan Newton]

As someone who spent many years putting data in S-expression format, it
seems natural to me to write multiple S-expressions (or JSON objects) to a
file, and expect a reader to be able to read them back one at a time.

This seems comparatively uncommon in the JSON world.  Accordingly, it looks
like the most popular JSON parsing lib, Aeson, doesn't directly provide
this functionality.  Functions like decode just return a "Maybe a", not the
left-over input, meaning that you would need to somehow split up your
multi-object file before attempting to parse, which is annoying and error
prone.

It looks like maybe you can get Aeson to do what I want by dropping down to
the attoparsec layer and messing with IResult.

But is there a better way to do this?  Would this be a good convenience
routine to add to aeson in a PR?  I.e. would anyone else use this?

Thanks,
  -Ryan
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