matplotlibrc and the XDG base directory standard

After updating Ipython (1.0dev) and Matplotlib (1.4.x), a warning comes up when starting the Ipython notebook:

>UserWarning: Found matplotlib configuration in ~/.matplotlib. To conform with the >XDG base directory standard, this configuration location has been deprecated on >Linux, and the new location is now '/home/user/.config'.  Please move your >configuration there to ensure that matplotlib will continue to find it in the future.

I tried to follow the instructions so I created a new directory 'matplotlib' in ~/.config and moved matplotlibrc there. However, no customization is taking place. 

Is this a bug? I'm running Linux Mint 15 and as I said, Matplotlib 1.4 and Ipython 1.0dev.