Documentation
- Updated README and CLI help to reflect latest protocol and code changes (e3e2c74)
- Added `doc/http-client-api.md, documenting the http client api and websocket interface. (5453321)
- Added section about JSON mode in http client API documentation (408c0fb)
- Updated README to point to the different guides and include the new features (f09a28c)

Features
- Added `/json` mode for clients without CBOR and the `/node` command now returns the node id via ws (e9633ff)

Example
- Added `dtnecho_json.go` illustrating how to write clients using only JSON and websockets (4c0b76b)