Conversations:
- Make the notification headline the subject if it's there.
- Add GDN_Conversation.Type for future use.
Allow messages to filter by category.
vB imports: set guest posts to System
Merge branch 'master' of github.com:vanillaforums/Garden
$Config should always be an array.
$DefaultConfig should also always be an array
Roles may be personal info
relative path for ImageUpload plugin images
Merge remote-tracking branch 'upstream/master'