Add support for Authentication

[defeated]

http://blizzard.github.com/api-wow-docs/#id3524790

Although most of the application can be accessed without any form of authentication,
we do support a form application registration and authentication. Application
authentication involves creating and including an application identifier and a request
signature and including those values with the request headers.

The primary benefit to making requests as an authenticated application is that you
can make more requests per day."

[defeated]

Additionally, once an API Key is assigned, requests should go over https instead of just http.

Important

We strongly advise that client library developers make secure requests using SSL whenever application authentication is used.

[defeated]

Update:

Today Blizzard has approved my outstanding request for an API key! And there was much rejoicing.