Notification by mail:
Add new informations about last categories and last images like new feature of RSS notification.
2 parts:
- Possibility to send HTML mail
- Include last categories and last images on HTML format into notification mail
ccs & HTML experts! Please! Check, fix, improve and enhance HTML mail content!
git-svn-id: http://piwigo.org/svn/trunk@1784 68402e56-0260-453c-a942-63ccdbb3a9ee
