adding optional callbacks everywhere, work in progress
deferred implemented, ttl added, needs more testing
added Sync fns, docs
got rid of sugar and _
added keys, docs, fixed counter example
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Update README.md
filtering ttl keys, delaying expired deletion
merge
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Update README.md
comment fix
ttls are now persisted in a sibling directory, options.dir + ttl
merge with upstream
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Merge pull request #27 from akhoury/master

TTL + lots of changes