Upgrade to rspec 2.14

This adds
- expect(obj).to receive(:method)
- allow(obj).to receive(:method) #stubbing
- allow_any_instance_of(Class).to receive(:method)

Personally, this makes specs much easier to write.

This PR only updates deprecated methods in specs. It does nothing else
@kbrock I'm not crazy about this change.  I think we were expecting a specific error class here.