0.20.6 (2016-06-19)
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* `Tree`: Detect and accept already defined `Celluloid::Supervision::Configuration` vs. fail as if undefined.
* Updated gem dependencies.

0.20.5 (2015-09-30)
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* Revamped test suite, using shared RSpec configuration layer provided by Celluloid itself.
* Updated gem dependencies provided by Celluloid::Sync... extraneous gems removed, or marked as development dependencies.

0.20.1 (2015-08-06)
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* Fixed arity checking
* Added usage examples to README
* Change reference to `Actor::System` ( was `ActorSystem` )

0.20.0 (2015-07-04)
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* Extracted from Celluloid
* Re-added Supervision Trees
* Added Configuration object
* Added injections and behaviors
