Additional demos

I added 3 demos.

1. List of Dinosaur Facts using template repeat with all the data.
2. List of Dinosaur Facts using orderByChild on order field and limited with EqualTo ornithischia
3. List of Dinosaur Facts using orderByChild height all data using childEvents and on-child-added to list in order by height

My goal is to demonstrate some of the nuances of using the firebase-element.