@IBAction func createAccount(sender: AnyObject) {

    var username = usernameField.text
    var email = emailField.text
    var password = passwordField.text

    if username != "" && email != "" && password != "" {

        FIRAuth.auth()?.createUserWithEmail(email!, password: password!, completion: { (user, error) in


            databaseRef.child("users/(user.uid)/username").setValue(username)
            databaseRef.child("users/(user.uid)/password").setValue(password)
            databaseRef.child("users/(user.uid)/uid").setValue(user?.uid)

        })

    } else {

        print("please complete all fields")

    }

}