Gravity Forms User Registration Addon 5.3.0

- Fixed a fatal error which can occur when getting the BuddyPress fields.

- 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.