Added test for issue #760; private_class_method :new raises exception.
Parsing private_class_method no longer raises an exception for inherited
methods, like :new.
Removed inaccurate tests for private_class_method handler.
Fixed issue #760. private_class_method handler no longer raises an unhandled
exception for methods unknown to the parser, like the inherited method :new.
However, it will account for calling private_class_method in reopened classes.
Excluded private_class_method handler tests from legacy mode.
Merge pull request #767 from amclain/master

Fix issue #760: private_class_method causes exception