register listeners recursively

gistfile1.java

public void registerListeners() throws IOException, ClassNotFoundException, InstantiationException, IllegalAccessException {           
    PluginManager pluginManager = this.getServer().getPluginManager();                                                                 
    for(ClassPath.ClassInfo classInfo: ClassPath.from(this.getClassLoader()).getTopLevelClasses("de.muwbi.clashofnations.listeners")) {
        pluginManager.registerEvents((Listener) Class.forName(classInfo.getName()).newInstance(), this);                               
    }                                                                                                                                  
}