Complex custom elements in Polymer 1.0

Creating a more complex custom element in Polymer 1.0 to display all of the flags we have access to. Playlist: https://www.youtube.com/playlist?list=PLPaj_o9gjMYll0sSb47TrzQCjIo5iqQZm JSON file: https://raw.githubusercontent.com/StretchProjects/polymer-project/video8/countries.json