code: protected long getLastModified(IAggregator aggregator, ModuleList modules) {
  		long result = 0L;
  		for (ModuleList.ModuleListEntry entry : modules) {
  			IResource resource = entry.getModule().getResource(aggregator);
  			long lastMod = resource.lastModified();
  			result = Math.max(result, lastMod);
  		}
  		return result;
  	}
docs: Returns the newest last modified time of the files in the list
  
  @param aggregator
  @param modules
  The list of ModuleFile objects
  @return The newest last modified time of all the files in the list