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auto commit and add event for rebalance (#889)

* auto commit and add event for rebalance

Should resolve #787

If auto commit is true, commit before we rejoin the group on a rebalance
According to the kafka protcol, commits are allowed during this stage, as the generation ID has not been bumped yet.

If auto commit is disabled, implementors need a way to decide what to commit, so an onRebalance option was added.

Implementors can perform commits during this method and call back when done to finish the rebalance.

* Auto commit on ConsumerGroupStream during rebalance too

This required special behavior due to the separate commit queue

* Actually shouldn't be checking the autoCommit setting for CGS

commit(null, true) will flush what was already in the queue.

* Bubble errors from user defined callback up, and cancel saving

* use ._once instead of manual flag checking

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