Jsonrpcserver

- Added asyncio support. (Python 3.5+)
- Added a *methods* object to the jsonrpcserver module (so you can import
jsonrpcserver.methods, rather than instantiating your own).
- Added methods.dispatch().

- Fix Methods.serve_forever in python 2 (thanks bplower)

- Updated method of logging exception (thanks bplower)

- Pass Methods named args onto MutableMapping
- Remove unused logger

- Allow passing dict to Methods constructor

- A basic HTTP server has been added.