Add an article about gnome-background-generator.

python/dynamically-change-your-gnome-wallpapers.rst

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+Dynamically change your gnome desktop wallpaper
+###############################################
+
+:date: 21-10-2010
+
+In gnome, you can can use a XML file to have a dynamic wallpaper.
+It's not so easy, and you can't just tell: use the pictures in this folder to do
+so.
+
+You can have a look to the `git repository`_ if you want: http://github.com/ametaireau/gnome-background-generator
+
+Some time ago, I've made a little python script to ease that, and you can now
+use it too. It's named "gnome-background-generator", and you can install it via
+pip for instance.
+
+.. code-block:: shell
+
+   $ pip install gnome-background-generator
+
+Then, you have just to use it this way:
+
+.. code-block:: shell
+
+    $ gnome-background-generator -p ~/Images/walls -s
+    /home/alexis/Images/walls/dynamic-wallpaper.xml generated
+
+Here is a extract of the `--help`:
+
+.. code-block:: shell
+
+    $ gnome-background-generator --help
+    usage: gnome-background-generator [-h] [-p PATH] [-o OUTPUT]
+                                      [-t TRANSITION_TIME] [-d DISPLAY_TIME] [-s]
+                                      [-b]
+
+    A simple command line tool to generate an XML file to use for gnome
+    wallpapers, to have dynamic walls
+
+    optional arguments:
+      -h, --help            show this help message and exit
+      -p PATH, --path PATH  Path to look for the pictures. If no output is
+                            specified, will be used too for outputing the dynamic-
+                            wallpaper.xml file. Default value is the current
+                            directory (.)
+      -o OUTPUT, --output OUTPUT
+                            Output filename. If no filename is specified, a
+                            dynamic-wallpaper.xml file will be generated in the
+                            path containing the pictures. You can also use "-" to
+                            display the xml in the stdout.
+      -t TRANSITION_TIME, --transition-time TRANSITION_TIME
+                            Time (in seconds) transitions must last (default value
+                            is 2 seconds)
+      -d DISPLAY_TIME, --display-time DISPLAY_TIME
+                            Time (in seconds) a picture must be displayed. Default
+                            value is 900 (15mn)
+      -s, --set-background  '''try to set the background using gnome-appearance-
+                            properties
+      -b, --debug