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feature
- added supporting py3
- added registering application errors
fixed bugs
- Dont raise internal error for server exceptions `13 <https://bitbucket.org/aodag/jsonrpc2/issue/13/dont-raise-internal-error-for-server>`_
- incorrect Content-type `15 <https://bitbucket.org/aodag/jsonrpc2/issue/15/incorrect-content-type>`_
- internal logging configuration broken `16 <https://bitbucket.org/aodag/jsonrpc2/issue/16/internal-logging-configuration-broken>`_