code: @ApiModelProperty(value = "Categories of services registered. Not used at the moment")
  	public List<String> getCategories() {
  		Set<String> keySet = this.services.keySet();
  		Iterator<String> it = keySet.iterator();
  
  		List<String> categories = new ArrayList<String>();
  
  		DescribeService service;
  		while (it.hasNext()) {
  			service = this.services.get(it.next());
  			for (String category : service.getCategories()) {
  				if (!categories.contains(category)) {
  					categories.add(category);
  				}
  			}
  		}
  
  		return categories;
  	}
docs: Iterates the {@link DescribeService} registered and returns a list of
  available categories
  
  @return