Log apps launched via unity-place-applications

The apps launched from Unity's applications' place are not logged in Zeitgeist. The ones launched from the launcher is - since it uses the libzeitgeist GIO module. The reason that the apps place isn't triggering the GIO module is because it uses the UnityAppInfoManager which constructs DesktopAppInfos in a way so that they don't have a desktop id (which causes the libzeitgeist gio module to discard the event since there isn't enough metadata to make it useful).

The Real Fix (TM) would be to have upstream GIO include the patch series here: https://bugzilla.gnome.org/show_bug.cgi?id=627836 and then UnityAppInfoManager can construct DesktopAppInfos just the way the libzeitgeist gio module likes it and everything would Just Work.

The slightly less elegant and less general solution would be to make the app launching in Unity's places code not use UnityAppInfoManager, but simply create the DesktopAppInfo itself in a way such that the appinfo has the desktop id set. - Or the totally gross hack would be to manually log the event directly from Unity's places code.