First commit. Initialize lvlupper HTML5 Boilerplate app using Initializr.

Learned:
* How to use HTML5 Boilerplate
* Practiced starting an app from almost-scratch
Integrate RequireJS. Integrate Backbone.js.

Learned:
* How to add RequireJS to an app
* How to use RequireJS to load modular JavaScript dependencies
* About modularized JavaScript and AMD (asynchronous module definition)
* How to add Backbone.js to an app
Create app router. Add login view.
* Set up login and default routes.
* Create dummy login view.

Learned:
* How to create a Backbone router and define basic routes and route actions
* How to create a Backbone view and render a basic view
* Practiced writing modular JavaScript