Activity feed: Some type icons added ...
Activity feed: Bulletin icon added ...
Activity feed: Playlist icon links to video in playlist now ...
Activity feed: NOT TESTED / NOT IMPLEMENTED added ...
www/inc/youtube_api.inc.php: Splited into _constants/_receive/_common
youtube_api_comments.inc.php: Renamed && Submodule of www/inc/youtube.inc.php
www/inc/debug.inc.php: Added with API call counting stuff ...
Merge pull request #56 from NochEinDirk/my-contribution

Activity feed ready (closes #28 ) && API debuging stuff added ...