Special-cases `RSpec::Mocks::MockExpectationError` to remove interference
with RSpec testing. Admittedly, RSpec should not be relying on the exception
mechanism to ensure proper results and should instead use some sort of out-of-band
mechanism.
Merge pull request #20 from fiksu/Af_Application_work_rescues_RSpec_Mocks_MockExpectationError

Special-cases `RSpec::Mocks::MockExpectationError`