2.3.1  
* email subject now changeable/customisable (see template wppizza-order-email-subject.php)  
* eliminate fatal error when plugin is re-installed without properly uninstalling it first (why would you do that anyway though ? oh well...)  
* BUGFIX when empty delete all categories was selected, only non empty categories were deleted  
* BUGFIX when using shortcode [wppizza category='non-existing-cat'] with a non-existing category, errors were thrown on page instead of just a blank page without menu items  
- 29th July 2013

git-svn-id: https://plugins.svn.wordpress.org/wppizza/trunk@747742 b8457f37-d9ea-0310-8a92-e5e31aec5664