Bug 1044411 — Setup ToS to be served by loop-server.

This adds important patterns:
  - Grunt tasks (marked and sass)
  - The app directory that contains statics to be served.
  - The i18n management / translation
  - The handlebars templating system
  - Bower to get the last tos-pp version

I don't like having this on the loop-server side because it adds a lot of things to handle markdown/html on an API server that should only serve a Service.

Well at least it is pretty:

![tos](https://cloud.githubusercontent.com/assets/229453/3878684/8599cda4-2171-11e4-965a-4a97a4e829e3.png)

See: https://bugzilla.mozilla.org/show_bug.cgi?id=1044411