Update versions of JavaScript libraries.

Use Google's hosted libraries instead of vendoring. This is just for
testing purposes and browser caching will help after the first access.
Remove unecessary template.
Update the example app with a modern project template.
Add a link to the admin.
Add a README for the example project.
Ignore database for example project.
Merge pull request #408 from aaugustin/modernize-example-project

Modernize example project. Fix #406.