Separate of rules that need to be shimmed from rest of css
Use minimal list of imports on homepage
Use more core elements. Remove polyme-flex-layout usage
polymer-media-query -> core-media-query
remove page-scrim (old)
use core-ajax
use core-menu and core-item for dropdown
Remove polymer-ui-icon usage
Merge branch 'master' of https://github.com/Polymer/docs
merge master