Minor: imported Mine in __init__.py, to make the documentation actually work.
Dealt with exceptions better:
-- made exceptions which happened while processing an identifier say which identfier they were processing
-- made the generator just return StopIteration when gevent complains of an empty queue. (Note: I'm not 100% sure that LoopExit is only used to complain of an empty queue -- it looks like it, but I couldn't find anything explicitly saying so.)