[cookbook] [deployment] added cookbook showing how to deploy to the Microsoft Azure Website Cloud

The SensioLabs & Microsoft Azure staff recently collaborated to write this tutorial together to promote the Azure Website cloud platform. This tutorial is a step by step guide describing how to deploy a Symfony Standard Edition to Azure.

This tutorial has been written by the following team:

Hugo Hamon – Head of training – SensioLabs
Thomas Conté – Technical Evangelist – Microsoft
Benjamin Moulès – Technical Evangelist - Microsoft 

In the near future, the goal is also to expand the Deployment section of the Cookbooks to other famous hosting providers.
I've merged this so we can get it in for Monday. @hhamon if I propose a rewrite of this first section, will that be ok? I want to respect all parties (and I think it's actually nice to know that Microsoft is actively supporting Symfony hosting, gives confidence to readers).

Let me know!