Upgrade polymer-elements
For quetzal-popup-source's popup to be absolutely positioned.
Use new declarative event handler binding syntax.
Revert to Polymer 0.0.20131010 for now, latest release on 25 Oct seems horked.
Temporarily revert to old event binding syntax. (reverted from commit 122494465fc99d0e02b2a8a56167358fa54b696f)