+ * <li>SAVE_STORY [story] [luid]: save the story with the given LUID</li>
+ * <li>DELETE_STORY [luid]: delete the story of LUID luid</li>
+ * <li>GET_COVER [luid]: return the cover of the story</li>
+ * <li>GET_SOURCE_COVER [source]: return the cover for this source</li>
+ * <li>SET_SOURCE_COVER [source], [luid]: set the default cover for the given
+ * source to the cover of the story denoted by luid</li>