Auth                    Authorize the RGoogleAnalytics package to the
                        user's Google Analytics Account using OAuth2.0
GetFile                 Query the Google Analytics Premium API for the
                        specified dimensions, metrics and other query
                        parameters
Init                    Initialize the Google Analytics query
                        parameters
QueryBuilder            Initialize a QueryBuilder object with the given
                        parameters and perform validation
ToBody                  Returns the URI constructed from the parameter
                        settings. This also URI-encodes all the values
                        in each query parameter.
ValidateToken           Check whether the Access Token has expired
