Add Gravity to notice sources

db/notice_source.sql

@@ -9,6 +9,7 @@ VALUES
     ('Do','Gnome Do','http://do.davebsd.com/wiki/index.php?title=Microblog_Plugin', now()),
     ('Facebook','Facebook','http://apps.facebook.com/identica/', now()),
     ('feed2omb','feed2omb','http://projects.ciarang.com/p/feed2omb/', now()),
+    ('gravity', 'Gravity', 'http://mobileways.de/gravity', now()),
     ('Gwibber','Gwibber','http://launchpad.net/gwibber', now()),
     ('HelloTxt','HelloTxt','http://hellotxt.com/', now()),
     ('identicatools','Laconica Tools','http://bitbucketlabs.net/laconica-tools/', now()),