Unwrap wrapped drivers (#57)

* Ignore Maven target folder

* Use `WrapsDriver` instead of `EventFiringWebDriver`

`EventFiringWebDriver` also implements `WrapsDriver`, which is more general and should be implemented by all wrappers.

* Unwrap via reflection for backwards-compatability

Suggestion via #57 (comment).

Author: beatngu13

.gitignore

@@ -7,4 +7,5 @@ bin
 *.iml
 .idea
 screenshots
-*main.java
+*main.java
+target

src/main/java/com/assertthat/selenium_shutterbug/utils/web/Browser.java

@@ -22,7 +22,6 @@
 import org.openqa.selenium.remote.RemoteWebDriver;
 import org.openqa.selenium.remote.Response;
 import org.openqa.selenium.remote.http.HttpMethod;
-import org.openqa.selenium.support.events.EventFiringWebDriver;
 
 import javax.imageio.ImageIO;
 import java.awt.*;
@@ -109,9 +108,7 @@ public BufferedImage takeScreenshot() {
      * @return BufferedImage resulting image
      */
     public BufferedImage takeScreenshotEntirePage() {
-        if (driver instanceof EventFiringWebDriver) {
-            driver = ((EventFiringWebDriver) this.driver).getWrappedDriver();
-        }
+        driver = unwrapDriver();
 
         if (driver instanceof ChromeDriver) {
             return takeScreenshotEntirePageUsingChromeCommand();
@@ -127,7 +124,22 @@ public BufferedImage takeScreenshotEntirePage() {
         return takeScreenshotEntirePageDefault();
     }
 
-    public BufferedImage takeScreenshotEntirePageDefault() {
+    private WebDriver unwrapDriver() {
+        String[] wrapperClassNames = {"org.openqa.selenium.WrapsDriver", "org.openqa.selenium.internal.WrapsDriver"};
+        for (String wrapperClassName : wrapperClassNames) {
+            try {
+                Class<?> clazz = Class.forName(wrapperClassName);
+                if (clazz.isInstance(driver)) {
+                    return (WebDriver) clazz.getMethod("getWrappedDriver").invoke(driver);
+                }
+            } catch (ReflectiveOperationException e) {
+                // NOP
+            }
+        }
+        return driver;
+    }
+
+	public BufferedImage takeScreenshotEntirePageDefault() {
         final int _docWidth = this.getDocWidth();
         final int _docHeight = this.getDocHeight();
         BufferedImage combinedImage = new BufferedImage(_docWidth, _docHeight, BufferedImage.TYPE_INT_ARGB);