Reduce public interface ov Mutant::Env
Add specs for warning behavior on Class#name violations
Fix duplicate emit of neutral mutaiton on memoized instance methods
Add specs for Subject::Method::Instance#public?
Fix style

* Actually a hack to move an uncovered line togehter with a covered one.
* Will someone notice and complain?
* Is there a better idea?
Fix warning expectation specs
Reduce public interface of Subject
Add specs for Subject#tests
Use actor based parallelization

Conflicts:
	config/flay.yml