This branch is based on an old version of Polymer and has not been updated to support recent versions (such as 0.9.0 as of 2015-05-27). It is currently unlikely to work out of the box.
Based on the GDG Twin Cities site (http://dev.gdgtc.com/gdgtc-site-polymer), this page is a polymer implementation of boomerang, the templates for GDG chapters.
bower update
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the components folder is excluded from this git repo. Polymer code is most easily managed by Bower.