code: function makeHelper(obj, verb) {
    obj[verb] = function helper(url, options, f) {
      // ('url')
      if(_.isString(url)){
        // ('url', f)
        if(_.isFunction(options)){
          f = options;
        }
  
        if(!_.isObject(options)){
          options = {};
        }
  
        // ('url', {object})
        options.url = url;
      }
  
      if(_.isObject(url)){
        if(_.isFunction(options)){
          f = options;
        }
        options = url;
      }
  
      options.method = verb.toUpperCase();
      return obj(options, f);
    };
  }
docs: adds a helper for HTTP method `verb` to object `obj`