Update to Groovy 2.3.2
Merge branch 'master' of github.com:reactor/reactor
Merge pull request #340 from sshcherbakov/master

Fixes #294 by using Thread.getId() method instead of System.identityHashCode() to uniquely identify the JVM thread
Merge branch 'master' of github.com:reactor/reactor
Using a List for the internal cache caused multiple cache entries if the dispatcher was dispatching multiple tasks concurrently. Switching to a Set eliminates that possibility of returning a List with multiple entries of the same Registration.
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