Support expiring ops from oplog#33

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devongovett wants to merge 8 commits intoshare:masterfrom

devongovett:expire-ops

Commits on Oct 15, 2014

Callback with error instead of throwing in redis driver
devongovett
committed

Commits on Oct 18, 2014

Commits on Nov 4, 2014

Update getOps test for behavior change
devongovett
committed

Commits on Feb 9, 2015