Django spanish localflavor

Django sprint has finished, but not Django work. Today I've written some lines of code for adding some new features on Django. In this case, I've programmed a validation function for spanish NIF identification number. I've also created a couple of files with useful spanish data (regions and provinces in Spain).

The spanish localflavor package was created some months ago, but not yet submitted to subversion. I hope with this contribution (and more that I'm going to do) we can finish it soon.

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