Gravity Forms User Registration Addon 5.3.2

- Added validation error message to login form when an invalid email address is used

- Added security enhancements. Credit: Fletcher Horton - Horton's Art LLC.
- Fixed a PHP warning when populating a form field using the value from a BuddyPress datebox type field.
- Renamed the function hooked to the gform_merge_tags filter to prevent conflicts with other add-ons and custom code snippets.
- Updated gf_user_registration_login_form() to allow for login form arguments to be passed directly through a parameter.

- Added logging of BuddyPress field processing.
- Fixed an issue where the number field value may not use the format configured on the field.
- Fixed fatal error on main settings page when running PHP 7.1.
- Fixed strings for translations.
- Fixed an issue with the markup for the login widgets logged in message.