Gravity Forms Survey Add-On was updated to version 2.4, from version 2.3. Changelog:

• Added function gf_survey to easily get a Survey instance.
• Added text domain/path to header.
• Added support for Gravity Forms 1.9 form editor drag and drop.
• Updated protected functions to be public.
• Updated to have the file class-gf-survey.php and organized code into this file and survey.php.
• Updated version to use a variable.