1. New current group documents widget
2. Fixes in widgets.php
3. Fix notifications.php bug based on http://wordpress.org/support/topic/document-upload-notification?replies=6#post-5464069

git-svn-id: https://plugins.svn.wordpress.org/bp-group-documents/trunk@900073 b8457f37-d9ea-0310-8a92-e5e31aec5664