code: function reloadSources(names) {
  
      names = u.isArray(names) ? names :
             names ? [names] :
             u.keys(opts.source$);
  
      var results = [];
  
      u.each(names, function(name) {
        var source = opts.source$[name];
        if (source) {
          source._reloadFromSource = true;
          results.push(name);
        } else {
          results.push(log('reloadSources unknown source ' + name));
        }
      });
  
      generator.reload(); // throttled
      return results;
    }
docs: trigger reload from source input = string or array of source names, nothing => all