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Add "delayed" datastore.

This is a partial extraction from go-ipfs/thirdparty/datastore2.

I have added a test.

ci: use the latest standard travis scripts

Delete old, unused datastores

Add Size() method to datastores

Consistent with the rest of calls.

Fix lock usage in syncmount

This adds a PersistentDatastore interface which allows datastores
to report DiskUsage().

It implementes the interface on all wrapper types, which return
0 if the wrapped datastore does not provide this method.

Related: https://github.com/ipfs/go-ipfs/pull/4550

Readme: fix godoc link and add godoc shield

update go.uuid

It now returns entropy errors so we now need to handle them. Lovely.

Implement json.Marshaler and json.Unmarshaler on datastore.Key

Fix warnings and errors on go-tip

Add locks to maintenance methods is syncds

Define GCDatastore/CheckedDatastore interfaces