init method
Intialize both rest and scoketio client
Implementation
init({@required String baseUrl, Map<String, dynamic> extraHeaders}) {
// if (Foundation.kReleaseMode) {
// // W're on release mode
// dev = false;
// } else {
// // W're not on release mode
// dev = true;
// }
rest = new RestClient()..init(baseUrl: baseUrl, extraHeaders: extraHeaders);
scketio = new SocketioClient()..init(baseUrl: baseUrl);
}