Added missing hook to delete_container action

res/stevedore.glade

@@ -47,6 +47,7 @@
         <property name="tooltip" translatable="yes">Delete the selected container.</property>
         <property name="stock_id">gtk-delete</property>
         <property name="always_show_image">True</property>
+        <signal name="activate" handler="on_delete_container_action_activate" swapped="no"/>
       </object>
     </child>
   </object>

src/stevedore.py

@@ -209,6 +209,12 @@ class MainWindow(Gtk.Application):
         # anyway.
         print "Not implemented: on_log_action_activate"
 
+    def on_delete_container_action_activate(self, obj, event = None):
+        """
+        User wants to delete a selected container
+        """
+        print "Not implemented: on_delete_container_action_activate"
+
     def on_build_action_activate(self, obj, event = None):
         """
         Command for building new images from Dockerfiles