Revert non-blocking notifications.

The output from the fork exiting is very annoying.

.bashrc

@@ -339,9 +339,9 @@ __command_notifier () {
         then
             if [ "$exitstatus" -eq '0' ]
             then
-                echo "$last_command has finished." | notify &
+                echo "$last_command has finished." | notify
             else
-                echo "$last_command has failed." | notify --urgency=critical &
+                echo "$last_command has failed." | notify --urgency=critical
             fi
         fi
     fi