Explain the difference between attributes attribute and publish property. Fixes #226
Mention declarative nature of `attributes`. Clean up language a bit
Merge pull request #229 from Polymer/explain-attributes-publish

Explain the difference between attributes attribute and publish property. Fixes #226
README: add info on releases
More scroll behavior for article/reference
Ignore components and polymer-all
Cut release
merge
update submodule
merge
Make building docs faster by excluding dupe directories from jekyll output folder and instead, rewriting URLs in GAE