Log Message:
libnotify: update to 0.8.4.

New in 0.8.4
============

* notification: Set the icon-name property as image hint instead of as app-icon
  [Julian Sparber]
* notify-send: Require valid UTF-8 for Summary and Body [Logan Rathbone]
* notify-send: Allow sending an empty summary [Evy Garden]
* notify-send: Flush stdout after printing notification ID [delthas]
* build: Improve mapfile and support building in solaris [Alan Coopersmith]
* libnotify/notification: Modernize the NotifyNotification class definition
  (and add support for auto-pointers) [Marco Trevisan]

* Bugs fixed:
  - #35 notify-send dumps core if notification message is invalid UTF-8 [Logan
    Rathbone]
  - #39 libnotify should be quiet [Bastien Nocera]
  - #44 fdo documentation link outdated in README.md [Marco Trevisan]