Cache bust js
Merge branch 'master' of https://github.com/Polymer/docs
Merge branch 'master' of https://github.com/Polymer/docs
Remove paper-spinner for now
Merge branch 'master' of https://github.com/Polymer/docs
Update paper-buttons on homepage
Fixes #670
Update rest of docs paper-button usage
Merge pull request #672 from Polymer/fix671

Update paper-button to latest API changes