Selenium test added (#906)

* add a selenium test for firefox

* add geckodriver and firefox to travis

* install updated

* install updated

* try out suggested webdriver dependency class

* add more resilience

webgoat-integration-tests/pom.xml

@@ -10,6 +10,17 @@
     </parent>
 
     <dependencies>
+    	<dependency>
+            <groupId>org.seleniumhq.selenium</groupId>
+	    <artifactId>selenium-java</artifactId>
+	    <scope>test</scope>
+	</dependency>
+	<dependency>
+    	<groupId>io.github.bonigarcia</groupId>
+    	<artifactId>webdrivermanager</artifactId>
+    	<version>4.2.2</version>
+    	<scope>test</scope>
+	</dependency>
         <dependency>
             <groupId>org.owasp.webgoat</groupId>
             <artifactId>webgoat-server</artifactId>