A minimal app based on Polymer Starter Kit Light!
Download this zip and open the contained project into the editor of your choice.
Fire up a local server from inside the app directory.
If you are a Windows user, install Python and from inside the app directory run:
python -m http.server 8080
or on a Mac/*nix machine, run:
python -m SimpleHTTPServer 8080
You can of course also use WAMP or an alternative tool for serving up content.