updates from ceph-tools
	updated README
	refactored basic simulations (*make, *test, __main__)
Server.py:	refactor to support new entry points
	makeServer (dict driven instantiation helper)
	servertest (dict driven test function)
	__main__ (built in sanity check)
performance model: convenience refactoring
	upgraded to match recent changes in ceph-tools
	all simulations now have dict-driven make helper
	all simulations now have dict-driven test helper
	all simulations now have __main__ test entry point
	test.py is now much simpler (having had much code removed)
snapshot the current todo list