Major changes in 2.91.8 are:
* Propagate custom icons to bookmarks
* Don't quit the application if there are file operations running
* Better keynav in the places sidebar
* Use symbolic icons for the notification area
* Fix some drawing regressions while renaming
* Fix issues with the default sort order selection
* Completely remove GConf dependency
* Large refactor of NautilusWindow/NautilusView architecture
* Cleanup installed desktop files
* Fix a couple of crashers
* Build with GCC 4.6