Created by: kasperpeulen
This allows user to implement https://github.com/facebookincubator/create-react-app/issues/741 (by symlinking the directories of packages manually to node_modules).
Not a complete solution, but I was refactoring my create-react-app to this structure, hoping that it could work manually as well, this is not the case, as webpack ignores the packages directory. This is all I need to make the refactoring work.