[#7] Pass: I should be able to use the RSpec's new expect syntax with VerifiedDouble.
[#7] Require verified_double/rspec_configuration to integrate verified_double with rspec.
[#7] Update features/verified_stubs.feature: Use allow syntax instead of stub.
[#7] Use expect syntax in own tests.
[#7] Fix RSpecMocksSyntaxOverrides: expect, allow, and receive should ignore plain rspec doubles.