options: move chunk_addressing_method to own module
chunk: add range specs
chunk: add chunk parsing to support have message

- tests
- specs
- sample wire data
chunk: add TODO for missing bin range indicators
options: use same name as spec for chunk_addressing_method
message: pass swarm options through to parser where required
dgram: pass swarm options through for message unpacker
have: with tests
dgram: a truly despicable hack
Merge pull request #21 from skunkwerks/feature/have-message

implement have message
- factor out chunk parsing into separate module
- pass swarm options down through the parser