Free server when we're done with it.

This frees up a lot of memory, and closes the server socket so that the
operating system doesn't have to do it, because the operating system may
take a while to actually close the socket.

src/Telodendria.c

@@ -380,6 +380,7 @@ main(int argc, char **argv)
     /* Block this thread until the server is terminated by a signal
      * handler */
     HttpServerJoin(httpServer);
+    HttpServerFree(httpServer);
 
 finish:
     Log(lc, LOG_TASK, "Shutting down...");