* libnm-glib/nm-device.c (nm_device_get_description): Implement.

	* libnm-glib/nm-client.c (nm_client_manager_is_running): Implement. Also add a
	"manager-running" signal that notifies the appearance/disappearance of NM.
	(nm_client_sleep): Implement.

	* libnm-glib/nm-device.c:
	* libnm-glib/nm-device-802-11-wireless.c: 
	* libnm-glib/nm-device-802-3-ethernet.c: 

	Don't inherit from DBusGProxy, add a proxy to private
	data. The reason is, classes inherited from NMDevice wouldn't get any dbus signals
	for anything but their own dbus interface. DBusGProxy objects support only one
	interfaces and to work around this, NMDevice has spearate proxy for each dbus
	interface. The nice side effect of this change is that we do not create a new
	DBusGProxy object for each property access.



git-svn-id: http://svn-archive.gnome.org/svn/NetworkManager/trunk@2479 4912f4e0-d625-0410-9fb7-b9a5a253dbdc