Add event when highlight event listener is registered#27

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runn-vermel wants to merge 7 commits intoPolymerElements:masterfrom runn-vermel:master

+37-2

Commits on Oct 6, 2016

Firing event when highlight event listener is registered
runn-vermel
authored

Commits on Oct 7, 2016

Commits on Oct 13, 2016

added test to ensure the event is received.
runn-vermel
authored
Fixes PolymerElements#26

runn-vermel
authored and
Vermel, Runn (GE Global Research)
committed
Merge branch 'master' of https://github.com/runn-vermel/prism-element
Vermel, Runn (GE Global Research)
committed