Revision history for Perl extension Thread::Workers.
0.06  Wed Sep  5 21:45:00 2012
		- Removed semaphore to control worker count, seems pointless if every ++ on count I ->up() the semaphore.
		- Removed Stop (!!!!) for boss and workers.
		- Replaced stop_boss/worker with pause_boss and pause_worker. Threads don't die. They just go to sleep. 
		- *New method* Thread::Workers::set_drain_cb(\&method_deals_with_drained_queue);
		    - You may not want to lose your queue. You can set a sig INT/KILL hook.
		    - Thread::Workers::drain() will stop the boss and workers if not stopped, and drain the queue, and feed 
			the data to the callback you set with set_drain_cb.
		    - drain() is the preferred way to kill all the threads, it does things in the right order to drain the log and queue.
		- Fixed a bug where workers weren't reading in the right wakeup value, but it worked on accident. Now It Works for the right reason. ;)
		- Removed _tid var, implicit in _thread key
		- Fixed not locking _worker_cmd when stopping workers (same on boss_cmd)
		- Added in locking to all *reads* of _worker_cmd also. Read someplace this was necessary on older perls.
		- Even more POD fixes (I'll get POD to work right one day!)
		- In a sleep state, workers change their interval to 1 sec. After waking, they go back to normal.
		- Same for the boss on sleep state interval changes

0.05  Tue Sep  4 08:30:00 2012
		- POD updates and fixes

0.04  Mon Sep  3 21:29:12 2012
	- kal:	- separated out thread creation sub
		- simplified worker creation/adding subs
		- updated POD documentation, including example


0.03  Mon Sep  3 15:00:00 2012
	- kal:	- added worker log and boss callback for log processing
		- fixed numerous bugs, added semaphores to log the _*_cmd vars when controlling threads
		- changed thread numbering scheme. totalthreads now includes boss.

0.02  Sun Sep  2 14:25:12 2012
	- kal:  - fixed version numbers and time stamper
		- fixed not sharing _cmd signaler to new workers
		- fixed not sharing _pid to new workers
		- added boss_sleep() and workers_sleep() methods
		    - this causes boss/workers to finish their current task, then enter a sleep state until woken or killed
		- added boss_wake() and workers_wake()
		    - causes boss/workers to wake from a sleep state. if already awake, does nothing.
		- added work log
		    - if worker has a return value, it stores it in a work log. The boss on each cycle will either empty this log
		      or you can assign an optional callback for the boss to process the data. regardless, this log is deleted
		      on each boss thread cycle.
		    - added a semaphor to lock access to this log. probably best if you only return a pass/fail from a worker. ;)
		- fixed some POD commenting

0.01  Sun Sep  2 08:00:00 2012
	- kal: original version;