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Also:

1. Specify the threading guarantees.
2. Vastly simplify it to use a single channel for synchronization.

This way, not *all* DAGServices need to implement this interface, they can just
implement it as an optimization.

This is a WIP/RFC attempt at extracting DAGService from go-ipfs.

gx: update go-cid, go-multibase, base32

rework block decoding framework

1. Use an interface instead of a map so that we can define fancier block
   decoders.
2. Make DefaultBlockDecoder thread safe.

Fix the coverage badge in the README

(make it use codecov)

Add tests

Makes it *much* harder to accidentally break something.

Use Codecov instead of Coveralls

Update go-cid, go-datastore

As we do in most other repos.

README: update badges for repo rename

Update go-cid (and go-block-format)

Implement a block decoding system

To register a new block decoder:

1. Define a function conforming to the `DecodeBlockFunc` type signature.

2. Add it to the `DefaultBlockDecoder` map from a your package's `init`
   function.

This way it's clear that all nodes are valid blocks.

gx update-tree go-cid go-libp2p-interface-pnet