Bug 669847 - Fix up online notification (part 2)
Bug 669847 - Fix up online notification (part 2)

Use GNetworkMonitor (in GLib 2.31) for offline detection if available.

Distrotech/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,gcampax/evolution-data-server,matzipan/evolution-data-server,gcampax/evolution-data-server,gcampax/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,Distrotech/evolution-data-server,Distrotech/evolution-data-server,gcampax/evolution-data-server,tintou/evolution-data-server,Distrotech/evolution-data-server,Distrotech/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server