Investigate if object rest works correctly in tests on master

Created by: gaearon

I want to hold off releasing 0.7.0 until we figure out if this is an issue: https://github.com/facebookincubator/create-react-app/issues/892#issuecomment-253669786.

I would appreciate help trying to reproduce this in tests in master, and if it reproduces, a fix. I presume that the fix would include whitelisting destructuring transform regardless of Node version.