Make proxies notify any instance recorders when they receive messages.
Ensure we take the class hierarchy into account when finding any_instance recorders.
Ensure our any_instance notification works when the mock proxy was created previously.
Only fulfill any_instance expectations when args match.
Don't allow a second instance to receive the message.

This aligns with the normal `any_instance` behavior.
Add changelog entry.
Work around a few travis/bundler issues.
Merge pull request #654 from rspec/subscribe-recorders-to-proxies

Subscribe recorders to proxies