code: public static <T> T toObjectWithXStream(final String xmlString,
  		final Map<String, Class<?>> aliases)
  	{
  		return toObjectWithXStream(null, xmlString, aliases);
  	}
docs: Creates from the given xml string an Object. The given map hold the aliases. For more
  information with aliasing see documation of xstream.
  
  @param <T>
  the generic type of the return type
  @param xmlString
  the xml as string object
  @param aliases
  the aliases
  @return the created object from the given xml string.