Timeout callback

[Alex Sharp]

 Would there be any support for a worker-level timeout callback, for workers that get killed by the master process for violating the Unicorn::Configurator.timeout setting?

I'm thinking the method could be on the Unicorn::Configurator class, something like ".at_timeout_exit". My thinking here is I want to be able to invoke caller() and get a backtrace to figure out the code that's resulting in timeouts. 

-- 
Alex Sharp

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