Luggage_isu 3.5.3-5.3 Released

Merged with upstream Luggage 3.5.3. Includes the latest version of suitcase and suitcase_interim themes, and bug fixes.

A full list of changes can be found in LUGGAGE_CHANGELOG.txt and LUGGAGE_ISU_CHANGELOG.txt

The release is available at https://github.com/isubit/luggage_isu/releases/tag/5.3

Release Notes:

• Luggage now requires the token_filter module. Please download it before updating.