class User {
    var userJSON: [String:AnyObject]?
}

let sharedUser = User()

Alamofire.request(.GET, "https://gyminyapp.azurewebsites.net/api/User").authenticate(user: emailTextField.text!, password: passwordTextField.text!).responseJSON {
                json in
                let responseJSON = json.result.value as? [String: AnyObject]
                // print("JSON: (responseJSON)")
                if responseJSON!["message"] != nil {
                    let errorMessage = responseJSON!["message"] as! String
                    alert = UIAlertController(title: "Error", message: errorMessage, preferredStyle: .Alert)
                    alert?.addAction(okButton)
                    alert!.view.tintColor = BarItems.greenTintColor
                    self.presentViewController(alert!, animated: true, completion: nil)
                } else {
                    if responseJSON != nil {
                        sharedUser.userJSON = responseJSON
                    }

                    self.performSegueWithIdentifier("tabSegue", sender: nil)
                }
            }

// Return user to sign in screen
    self.dismissViewControllerAnimated(true, completion: nil)