fix two way binding for selectedIndex and other fields
In general, we were quite confused about bind- fields, since they were added to the "attributes" dictionary but they had already been camelCased.

Review URL: https://chromiumcodereview.appspot.com//14121018
Upgrading web_ui to 0.4.6

Review URL: https://chromiumcodereview.appspot.com//13999004
fixes for latest sdk

Review URL: https://chromiumcodereview.appspot.com//13845018
hot fix - use latest html5lib