**What** and **Why**:
* When using npm version 2, `object-assign` and `fbjs` were not getting properly installed
* This PR adds `object-assign` and `fbjs` as explicit dependencies to both `react-test-renderer` and `react-addons`
* Ensure lib/ is packaged for react-test-renderer
* Run npm pack from right working directory
We were running this on the original packages not the compiled ones, resulting in missing files
Brian Vaughn