simplify style system

luigi/widget/status.lua

@@ -1,6 +1,24 @@
 --[[--
 A status bar.
 
+This widget will display the @{attribute.status|status} attribute of the
+hovered widget. Only one status widget should exist per layout. If multiple
+status widgets exist in the same layout, only the last one created will
+display status messages.
+
+@usage
+    -- create a layout containing some buttons and a status bar
+    local layout = Layout {
+        { type = 'panel', flow = 'x',
+            { text = 'Do stuff', status = 'Press to do stuff' },
+            { text = 'Quit', status = 'Press to quit' },
+        },
+        { type = 'status', height = 24 },
+    }
+
+    -- show the layout
+    layout:show()
+
 @widget status
 --]]--