Boxed background for phone add shows.
Boxed background for tablet add show layouts.
Merge branch 'beta' into cloud-backend
Set Android debug apps client ids, audience.

- As documented by
https://developers.google.com/appengine/docs/java/endpoints/auth#Java_Specifying_authorized_clients_in_the_API_backend.
Add show endpoint sources.
Move backend source into app module.
Simple show uploader for register activity.