Merge pull request #8 from dawryn/master

Propagate config through recursive calls to jsonclass.dump()
jsonclass: Code format & version update
Corrected compatibility with JSON-RPC 1.0

If a client sends a JSON-RPC 1.0 request to a JSON-RPC 2.0 server, the
latter must respond with a 1.0 response.
Correction of the README file to match current API
Version update (for next release)
Replaced old format syntax by str.format()
Propagate config through jsonclass