Listeners name refactor + Fix #831 for both Spigot and CraftBukkit

src/test/java/tools/utils/ServerUtils.java

@@ -0,0 +1,18 @@
+package tools.utils;
+
+public class ServerUtils {
+
+    /**
+     * Check if the server implementation is based on Spigot
+     * 
+     * @return true if the implementation is based on Spigot
+     */
+    public static boolean isSpigot() {
+        try {
+            Class.forName("org.spigotmc.CustomTimingsHandler");
+            return true;
+        } catch (ClassNotFoundException ignored) {
+        }
+        return false;
+    }
+}