* GnomeBG: Fix some logic errors wrt to caching of slideshows that may
cause nautilus crashes (Matthias Clasen)
* GnomeBG: Support multi-resolution backgrounds (Matthias Clasen)
* GnomeBG: Falls back to the default image if the user's background
doesn't exist (Ray Strode)
* GnomeBG: Prevent loops caused by setting URI (Søren Sandmann)
* GnomeBG: Fix leak (Kjartan Maraas)
* GnomeBG: Get rid of URIs and only use paths (Søren Sandmann)
* GnomeBG: Make sure tiles are at least 24 pixels wide (Søren Sandmann)
* GnomeBG: Some tweaks to the tile scaling heuristic (Søren Sandmann)
* GnomeBG: Small fixes (Søren Sandmann)
* GnomeBG: Add getters for the various properties (Søren Sandmann)
* GnomeBG: Monitor the image file (Søren Sandmann)
