Adding a fixture and broken test for module.exports

[elicwhite]

Adding a test case, fixture, and first step to fixing the module.exports non-enumerable transformation.

I noticed you had these expectation files in a specific folder. Matching the file structure and building off of the previous PR to try to fix it.

There are failing tests that probably need to be updated now that I changed this one but have to run out. I figure this is a good starting point and I will continue playing around with it if you don't get to it right away.

[speedskater]

Thanks for your PR. I integrated it into the branch transform-test-module-exports.
Could you please add usage samples for common.js module.exports where you test the rewire properties are indeed exported as non-enumerable properties?

[elicwhite]

Is there anything left for this?

[speedskater]

Thanks for providing this PR. I think this should be enough. As it seems that the latest changes have caused some regressions (#28) I will fix them first before i merge your PR. I think it will take till tomorrow. Sorry again for the delay.