Infrastructure and initial base files

- settings src set up with HTML including build block expressions, settings-app.js, ctr-google-calendar-settings.js
- widget src set up with HTML including build block expressions, main.js, and analytics.js
- all config files added
- bower.json configured with base dependencies
- package.json configured with base dependencies
- gulp file configured with all necessary base tasks
- README added
- initial translation.json added
- e2e and unit testing infrastructure in place