code: function loadDir(dir, db, callback) {
      callback = callback || function() {};
      
      //Get the absolute dir path if a relative path was given
      if (dir.substr(0, 1) !== '/') {
          var parentPath = module.parent.filename.split('/');
          parentPath.pop();
          dir = parentPath.join('/') + '/' + dir;
      }
      
      //Load each file in directory
      fs.readdir(dir, function(err, files){
          if (err) return callback(err);
          
          var iterator = function(file, next){
              loadFile(dir + '/' + file, db, next);
          };
          async.forEach(files, iterator, callback);
      });
  }
docs: Loads fixtures from all files in a directory
  
  TODO: Add callback option
  
  @param {String}      The directory path to load e.g. 'data/fixtures' or '../data'
  @param {Connection}  The mongoose connection to use
  @param {Function}    Callback