Show places in browsing left pane

[antistress]

GNOME is very cool with Places displayed within nautilus and GTKFileChooser, even more since it implements the XDG Base Directory Specification (with pictures/videos/documents etc. directories).
Therefore in most cases, user will have its files categorised following these directories.
For instance all my photos are stores in pictures folder.
Since i make use of pyRenamer to rename my photos from their EXIF date, it would be convenient to have direct access to the pictures folder through pyRenamer left pane.
Same for other files and other XDG base directories