A singleton that contains all of the servers that are trusted. Credentials will be sent with
any requests to these servers.
        
        
    
    Methods
    Adds a trusted server to the registry
    
| Name | Type | Description | 
|---|---|---|
| host | String | The host to be added. | 
| port | Number | The port used to access the host. | 
Example:
// Add a trusted server
TrustedServers.add('my.server.com', 80);
    Clears the registry
Example:
// Remove a trusted server
TrustedServers.clear();
    Tests whether a server is trusted or not. The server must have been added with the port if it is included in the url.
    
| Name | Type | Description | 
|---|---|---|
| url | String | The url to be tested against the trusted list | 
Returns:
    Returns true if url is trusted, false otherwise.
    
Example:
// Add server
TrustedServers.add('my.server.com', 81);
// Check if server is trusted
if (TrustedServers.contains('https://my.server.com:81/path/to/file.png')) {
    // my.server.com:81 is trusted
}
if (TrustedServers.contains('https://my.server.com/path/to/file.png')) {
    // my.server.com isn't trusted
}
    Removes a trusted server from the registry
    
| Name | Type | Description | 
|---|---|---|
| host | String | The host to be removed. | 
| port | Number | The port used to access the host. | 
Example:
// Remove a trusted server
TrustedServers.remove('my.server.com', 80);