Merge group membership in Packages

For truly drop in Packages, it would be great to merge group memberships across multiple packages.

For instance, if I have a DarkSky Package and a Weather_Underground package defined and in each have a Weather group defined, it would be great for the card to be combined for the UI.

I’m pretty sure this does not work currently.

// @norien @dale3h - We were talking about this in Gitter.
:point_up: April 21, 2017 12:17 PM