This PR does the following modifications for production deployment:
Add server config (app.yaml and package.json) for App Engine
Use "basePath": true in polymer.json to support differential serving with prpl-server-node
This option makes the build incompatible with static file servers, so this is not done on master
Modify the generated push-manifest.json to use HTTP/2 server push for assets with the initial navigate request (a.k.a. the "entrypoint"). This is done by running scripts/add_entrypoint_push.js after polymer build
This PR does the following modifications for production deployment:
"basePath": true
in polymer.json to support differential serving with prpl-server-nodepolymer build