wro4j-core/src/main/java/ro/isdc/wro/manager/factory/BaseWroManagerFactory.java
public BaseWroManagerFactory addModelTransformer(final Transformer<WroModel> modelTransformer) {
    if (modelTransformers == null) {
      modelTransformers = new ArrayList<Transformer<WroModel>>();
    }
    this.modelTransformers.add(modelTransformer);
    return this;
  }
public BaseWroManagerFactory addModelTransformer(final Transformer<WroModel> modelTransformer) {
    if (modelTransformers == null) {
      modelTransformers = new ArrayList<Transformer<WroModel>>();
    }
    this.modelTransformers.add(modelTransformer);
    return this;
  }
Add a single model transformer.