Notifications server for StumpWM.

Implements =org.freedesktop.Notifications= interface.
Shows notifications using =stumpwm:message= by default.

** Usage
Add
#+begin_src lisp
(load-module "notify")
#+end_src
to =.stumpwmrc=

Now you can run default server using =notify-server-toggle=.
In order to get your own notifications handler you can define on function
#+begin_src lisp
(defun notification-handler (app icon summary body)
  "Does things with incoming notifications"
  . . .)
#+end_src
