Add depute spider from nosdeputes.fr

This adds a pretty simple spider to fetch more rep data from nosdeputes.fr. It starts by fetching the list at /deputes/json then loops over reps inside and fetches their full profile at /<rep-slug>/json.

This will enable switching away from the .contrib.nosdeputes I just wrote in django-representatives :P

There is still work to be done to integrate this data into the Depute model, but as I don't need it yet I'll pass on that for now.