RC 10 - Small fixes, electron v4
With 1.0.0-rc.10, electron ^4.0.0 will be available for use when invoking the generator, and ^3.0.0 will be the default. Internally (for testing), electron v4 is used, along with spectron v5. The background.js
no longer relies on process.env.NODE_ENV
to determine whether to load from the dev server or from the packaged app (#164).