Netflix/Hystrix — pull request #367 by mattrjacobs (2014-12-17 00:21:19+00:00)
Title: Added thread pool metrics back to execution flow

Calls to ```threadPool.markThreadExecution()``` and ```threadPool.markThreadCompletion()``` got removed in the 1.3 -> 1.4 rewrite. This adds them back and gets the unit tests contributed by @nurkiewicz working. Thanks for those, @nurkiewicz!