data: Enable notifications by default
obex: Use FileManager1 XDG API to reveal file

Rather than just opening the containing folder, select and focus
the file using the new XDG API.

http://www.freedesktop.org/wiki/Specifications/file-manager-interface/
obex: Fix launch context leak

And refactor the code a bit.
obex: Use correct desktop-entry hint

gnome-user-share-properties.desktop doesn't exist anymore.
obex: Use Bluetooth icon for notifications
obex: Clean up obex_agent_new()

And move the _new() code to the agent init instead.
obex: Remove dead code
obex: Fix agent not working when restarting obexd

We need to watch obexd so that we can be sure that we can
re-register our agent when obexd comes and goes.

This is useful for debugging at least.

https://bugzilla.gnome.org/show_bug.cgi?id=712355