Preferences for selecting and loading site-specific rules
Refactored find_metadata.js into main_page_mod.js (losing flickr support, but that will soon be back with the new site rules support)
Add debug option to enable all log messages
Implement site rules, supporting Flickr
Use oEmbed for loading additional metadata according to site-rules.
Add site rules for deviantART.
Periodically check metadata relevance on Flickr.
Built XPI with new flickr support