Complete API library for the Cierge API.

Create a new client by calling the NewClient function. This accepts the following parameters:

• An http.Client that will be used as the underlying HTTP client that is used to make requests, otherwise a new http.Client is used.
• URL of the Cierge server
• User's API key that is used for authentication

With the Client, you can then use it to call any of the methods provided by this library.