code: function(regionDefinitions, defaults){
        var regions = {};
  
        _.each(regionDefinitions, function(definition, name){
          if (typeof definition === "string"){
            definition = { selector: definition };
          }
  
          if (definition.selector){
            definition = _.defaults({}, definition, defaults);
          }
  
          var region = this.addRegion(name, definition);
          regions[name] = region;
        }, this);
  
        return regions;
      }
docs: Add multiple regions using an object literal, where each key becomes the region name, and each value is the region definition.