#pragma mark - User Login
- (void)performLoginForUserName:(NSString *)aUsername withPassword:(NSString *)aPassword delegate:(id<MVSWebserviceDelegate>)aDelegate callback:(SEL)callback {
    NSURLRequest *request = [self urlRequestForMethod:@"user/login" parameters:[NSDictionary dictionaryWithObjectsAndKeys:aUsername, @"username", [aPassword md5Sum], @"password", @"json", @"format", nil]];

    [self dispatchRequest:request callbackSelector:@selector(userLogginResults:delegate:callback:) delegate:aDelegate clientCallbackSelector:callback];
}

- (void)userLogginResults:(NSString *)data delegate:(id<MVSWebserviceDelegate>)delegate callback:(SEL)callback {
    NSLog(@"data: %@", [data objectFromJSONString]);
    AppChannelUserResult *userResult = [[AppChannelUserResult alloc] initWithDictionary:[data objectFromJSONString]];

    [self dispatchClient:delegate callbackSelector:callback params:userResult, nil];
}