What's new in at-spi2-atk 2.5.4:

    Fix for bug #679013 - AtspiCollection should be implemented for
  all containers

* Don't create a (non-readable) subdirectory for the socket when root.

* Plug ref count leaks (BGO#679285).

* Only create a directory and a socket when requested.

* Only add items to the cache on children-changed if the children are
  included in the event.

* Only send PropertyChange signals used for caching, absent listeners.