Added unit test for Xbooru.com

src/test/java/com/rarchives/ripme/tst/ripper/rippers/XbooruRipperTest.java

@@ -0,0 +1,13 @@
+package com.rarchives.ripme.tst.ripper.rippers;
+
+import java.io.IOException;
+import java.net.URL;
+
+import com.rarchives.ripme.ripper.rippers.XbooruRipper;
+
+public class XbooruRipperTest extends RippersTest {
+    public void testRip() throws IOException {
+        XbooruRipper ripper = new XbooruRipper(new URL("http://xbooru.com/index.php?page=post&s=list&tags=furry"));
+        testRipper(ripper);
+    }
+}