Implemented new service method for generating API keys.
Implemented new endpoint.
Improved multiple endpoint groups handling.
Change-Id: Iba26fbf9123707b5b4c2d5e8c5a35d507404f24a
Added documentation.
Replaced PUT request with POST request.
Added inline param support for PATCH request.
Replaced unix timestamps handling with RFC-3339 timestampts handling.
Added 'Bearer' method requirement for Authorization header.
Change-Id: I4faa3864051dd18826c2c583ada53666d4aaec44