Gravity Perks - Nested Forms 1.1.57

Updated check for WooCommerce to be more comprehensive.

Added support for handling change in Gravity Forms 2.4.7 which adds support for wrapping GF's inline scripts in DOMContentLoaded listener.
Updated minimum Gravity Forms version to 2.4.
Updated logging for cron events to be more helpful.
Fixed issue where modal was not visible when other elements on page had a higher z-index.
Fixed issue where datepicker inside modal was displayed behind modal due to z-index conflict.

Fixed issue where close button does not appear when Bootstrap is loaded after jQuery UI.
Fixed notice when form mapped in Nested Form field no longer exists.