[remotefilelog] rfc: store refactor

[Durham Goode]

This is mainly aimed at Augie, but the refactor I did to remotefilelog to make it adhere to the ContentStore / MetadataStore pattern can be found here: https://bitbucket.org/DurhamG/remotefilelog/commits/branch/newstore  (20 patches, 44d67fe through 14125f8).  It's mostly code reorganization, so it's not as scary to review as it looks (there's very little new logic).

There's a bunch of naming issues (basestore.contains() is a bad name; ioutil should be moved into shallowutil; etc), but I'll probably fix that stuff as follow up patches.  All the tests pass for every commit.

Augie, take a look if you get a chance.  Otherwise I'll get someone at FB to review it before I push it.
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