chore(upgrade): Use Polymer 3 and modV 2
chore(upgrade): Use Polymer 3 and modV 2

Because we are updating to Polymer 3 and there are some breaking changes, we also update the version
of luminave to 3.0. Also added a howto for modV 2.

NERDDISCO/VisionLord,NERDDISCO/VisionLord,NERDDISCO/VisionLord,NERDDISCO/VisionLord,NERDDISCO/VisionLord,NERDDISCO/VisionLord