Garage release v0.3.0

Highlights:

- Highly improved codebase and documentation quality

- Garage can now work in 1-node and 2-node configurations thanks to a
  new parameter `replication_mode` that can be used to change
  replication to none or two-way replication

- Support for gateway-only nodes (these nodes do not store data directly
  but they can be used in certain scenarios to make requests faster)

- Datacenters are now called `zones`, as there are cases where it makes
  sense to have nodes in different physical locations belong to the same
  zone, and conversely

- New command `garage stats` to inspect cluster status

- New API endpoints: ListBuckets, GetBucketLocation, GetBucketVersioning

- XML response are now made with a real serializer so they should be
  correct (several XML encoding bugs fixed)

- S3 API now returns errors in XML format with codes similar to real S3
  return codes

- Minio-client mostly works, preliminary support for Duck

- Bootstrap & peer discovery improvements (peer list is now persisted to
  disk)

- Sled by default uses smaller cache (128MB), and can now be changed in
  the config file
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