Issue 66: client side error pop ups use default javaFx style

- created JFeonix style pop up to replace the default one

tags: #story[1273]

src/main/java/seng302/visualiser/controllers/dialogs/PopupDialogController.java

@@ -0,0 +1,56 @@
+package seng302.visualiser.controllers.dialogs;
+
+import com.jfoenix.controls.JFXButton;
+import com.jfoenix.controls.JFXDialog;
+import java.net.URL;
+import java.util.ResourceBundle;
+import javafx.event.EventHandler;
+import javafx.fxml.FXML;
+import javafx.fxml.Initializable;
+import javafx.scene.control.Label;
+import javafx.scene.input.MouseEvent;
+
+public class PopupDialogController implements Initializable {
+
+    @FXML
+    private Label headerLabel;
+    @FXML
+    private Label contentLabel;
+    @FXML
+    private Label closeLabel;
+    @FXML
+    private JFXButton optionButton;
+
+    @FXML
+    private JFXDialog popupDialog;
+
+    @Override
+    public void initialize(URL location, ResourceBundle resources) {
+
+    }
+
+    public void setContent(String content) {
+        this.contentLabel.setText(content);
+    }
+
+    public void setHeader(String header) {
+        this.headerLabel.setText(header);
+    }
+
+    public void setOptionButton(JFXButton jfxButton) {
+        this.optionButton = jfxButton;
+    }
+
+    public void setOptionButtonText(String text) {
+        this.optionButton.setText(text);
+    }
+
+    public void setOptionButtonEventHandler(EventHandler<? super MouseEvent> eventHandler) {
+        this.optionButton.setOnMouseClicked(eventHandler);
+    }
+
+    public void setPopupDialog(JFXDialog popupDialog) {
+        this.popupDialog = popupDialog;
+        this.closeLabel.setOnMouseClicked(event -> this.popupDialog.close());
+    }
+}