gausby / tortoise / 237

88%

Pull #42

travis-ci

Made an async version of subscribe

This is needed for the next_actions, as they cannot block the
controller. This require us to handle async results as handle_info in
the controller process; I've implemented it such that the controller
process knows what is in flight, and will error if it get a reference
to something unknown back.

The old `subscribe/3` has been renamed to `subscribe_sync/3` and has
the same behavior.

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