[AnerleyTpFeed] Don't include offline contacts in the feed
[AnerleyTpFeed] Don't include offline contacts in the feed

Rather then pushing all contacts into items and then into the feed only push
those that are online. Monitor them all for presence changing and then push
those that go online, remove those that go offline.

Fixes MB:#2855

meego-netbook-ux/anerley,meego-netbook-ux/anerley