Use a better method of detecting psych.
Use a better method of detecting psych.

The psych/syck specs were failing on 1.9.1 on travis ci.  You can compile ruby with the libyaml option but not actually have psych compiled in, apparently.
rwz/rspec-mocks,h4ck3rm1k3/rspec-mocks,rspec/rspec-mocks,AEgan/rspec-mocks,edwardpark/rspec-mocks,samphippen/rspec-mocks,telekomatrix/rspec-mocks,maclover7/rspec-mocks,samphippen/rspec-mocks,thoughtbot/rspec-mocks,maclover7/rspec-mocks,zephyr-dev/rspec-mocks,ducthanh/rspec-mocks,zephyr-dev/rspec-mocks,rspec/rspec-mocks,ducthanh/rspec-mocks,h4ck3rm1k3/rspec-mocks,rwz/rspec-mocks,edwardpark/rspec-mocks,telekomatrix/rspec-mocks,AEgan/rspec-mocks,thoughtbot/rspec-mocks