Inserts with callbacks are not actually async

[leonardoventurini]

When passing a callback to an insert the insert actually happens synchronously in the wrap and then the callback is is run asynchronously, which we think misses the point of running the actual insert async.

https://github.com/cult-of-coders/redis-oplog/blob/1daf81232ac1ef2483b3ff1808374937e3c70a3e/lib/mongo/Mutator.js#L72

Perhaps it should run all the rest of logic asynchronously when the callback is present (wrapping the callback).

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