applyDeps = function (fn, _this, _map) {
				var args = _.map(deps, function (key) {
					return _map[key];
				});
				return fn.apply(_this, args);
			}
Custom toCSV Method present

Detect dependencies and call it. If the last dependency is `callback`, call it asynchronously.

Support dependencies are:
  - req (current express request object)
  - user (currently authenticated user)
  - row (default row data, as generated without custom toCSV())
  - callback (invokes async mode, must be provided last)