Parameterized API key loading

[sigpwned]

Users should be able to use other approaches to loading API keys. The following approaches seem useful, although certainly there are others:

• GetApiKeys() - The current approach using the GetApiKeys endpoint
• GetApiKeys(customerId) - Use GetApiKeys customerId parameter to filter API keys. The API key's customerId field must match its value field.
• GetApiKeys(name) - Use GetApiKeys nameQuery parameter to filter API keys. The API key's name field must match its value field.

These values should be given in a String parameter. If the API key cannot be found with the given method, then unauthorized.