//perform user login in, setting nsuserdefaults and returning the bool result
        func login(username: String, password:String) -> (Bool) {

            var success:Bool = false

            //sending inputs to server and receiving info from server
            let postRequest = postDataToURL()
            postRequest.link = "http://pnc.hr/rfid/login.php"
            postRequest.postVariables = "username=" + username + "&password=" + pass

word

        postRequest.forData("POST") { jsonString in
            // getting the result from the asinhronys task
            let result = convertStringToDictionary(jsonString as String)
            if let loggedIn = result?["loggedIn"] as? Bool where loggedIn == true {

                let userType = result?["userType"] as? String
                let token = result?["token"] as? String

                //if user is logged - setting parameters in Key Chains and redirecting them to the menu view
                let defaults = NSUserDefaults.standardUserDefaults()
                defaults.setObject(loggedIn, forKey: "loggedIn")
                defaults.setObject(username, forKey: "username")
                defaults.setObject(userType, forKey: "userType")
                defaults.setObject(token, forKey: "token")

                success = true
            }
            else {
                success = false
            }
            print ("class - " + String(jsonString))
            print ("classIN - " + String(success))
        }

        print ("classOUT - " + String(success))
        return success
    }