code: function normalize(options){
      options = options || {};
  
      options.printfn = options.printfn || function(obj) {
        console.dir(obj, {colors: true});
      };
  
     if (!options.accept) {
        if (options.include) {
           options.accept = function(propKey) { return options.include.indexOf(propKey) >= 0; };
        }
        else if (options.exclude){
           options.accept = function(propKey) { return options.exclude.indexOf(propKey) < 0; };
        }
        else {
           options.accept = function() { return true; };
        }
     }
  
     options.fileFilter = fileFilter(options.filter);
  
     return options;
  }
docs: Normalize an `options` dictionary.
  
  @param {Object} options