code: public static ParticleSystem loadConfiguredSystem(String ref, Color mask)
  			throws IOException {
  		return loadConfiguredSystem(ResourceLoader.getResourceAsStream(ref),
              null, null, mask);
  	}
docs: Load a set of configured emitters into a single system
  
  @param ref
  The reference to the XML file (file or classpath)
  @param mask
  @return A configured particle system
  @throws IOException
  Indicates a failure to find, read or parse the XML file