repairs due to recent changes.
put code and output together into pg-view and show an example of using
it as embedded
add some polymer-ui-elements to Sandbox's metatdata
remove unneeded ids
make preview work without build
playground: option to have code editor and output stack vertically
instead of the default which is side by side; make the app to use
vertical layout in narrow screen size.
Merge branch 'master' of github.com:Polymer/projects
playground: add imports section to sidebar
playground: move sidebar stuffs to pg-sidebar; create a version of
pg-view that uses grid-layout
add "Add Import" and "View Source" buttons to toolbar when an element is
selected
playground: add "Add Element" button to generate an element tag
adjust to use v-flex and h-flex
playground: add grid-layout example
add noscript
adjust for folder and filename changes in more-elements
playground app: allow autoRun
first stab at whitelist and warning message for sandbox
better warning message
add yellow "not an ide" bar
adjust for changes in polymer elements