align ActorDSL.Act.become with context.become and add Act.becomeStacked
• change Act.become() to use discardOld = true
• add Act.becomeStacked() which uses discardOld = false
see https://groups.google.com/d/topic/akka-dev/JE1tjwzBp_A/discussion
• add Act.becomeStacked() which uses discardOld = false
see https://groups.google.com/d/topic/akka-dev/JE1tjwzBp_A/discussion
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