Uncommented coarse->fine assert within assertBothUpAndDownConversionRatiosCorrect

I'm not sure why I had this commented out— it works.

Also, removed the printf within assertBothUpAndDownConversionRatiosCorrect(); the STAssertTrue within assertConversionRatioCorrect() will report this same information if it fails.
Merge branch 'adhoc/travis-build-test' into feature/unit-models