code: function (patterns) {
  		// External restources have to be 1:1 dest to src, both strings
  		// Check for external first, otherwise expand the pattern
  		if (!_.isArray(patterns)) {
  			if (isExternal(patterns)) {
  				return [patterns];
  			}
  
  			patterns = [patterns];
  		}
  
  		return grunt.file.expand({filter: 'isFile'}, patterns);
  	}
docs: Get assets from pattern. Pattern could be
  - an array
  - a string
  - external resource
  
  @param patterns