Added 'firebase-loaded' event to notify clients when initial data has…#124

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johnlim wants to merge 2 commits intoGoogleWebComponents:masterfrom

Commits on Apr 6, 2016

Added 'firebase-loaded' event to notify clients when initial data has been loaded and can be accessed.
johnlim
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Commits on Apr 17, 2016

Alternate proposal to fire a 'firebase-loaded' event so that we do not make an additional query to firebase.
johnlim
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