Grunt: Add ability to update PGB zip
Grunt: Add ability to update PGB zip

Can’t use Github for PGB source since it’s too large

PeteBa/OpenSprinkler-App,PeteBa/OpenSprinkler-App,OpenSprinkler/OpenSprinkler-App,OpenSprinkler/OpenSprinkler-App,PeteBa/OpenSprinkler-App,OpenSprinkler/OpenSprinkler-App