Fix for #368: Breaks on setTextContent call when using minified knockout 

I ran into issue #368 and wanted to keep using the non-debug version of knockout in my project. 
The change makes the tests run against the production knockout 2.3.0 causing them to fail and then re-greens them by calling public methods.

I wasn't sure if it would be a problem debugging tests using the minified knockout but assume they need to run green against it before release.