Mofidied ref.actor so it now support serial of the value and queueing of delayed Get + added specs for it
Refactored Ref to instead combining on `ref` to start combine resulting discrete or continuos processes to obtain different combinations and functionality
fixed race condition on spec and property verifications
Refactored actor.Ref to perform the callback via supplied implicit strategy
fixed serial that was not stable on ref
Some API cleanup to async
Merge remote-tracking branch 'spinoco/async-pr' into async-pr
Discard AsyncRef and moved all functionality to Signal. Make `discrete` serial implementation private
Merge pull request #20 from Spinoco/async-pr

Proposed change in streams.async