RemovedInDjango19Warning: make RedirectView.permanent=False explicit
RemovedInDjango19Warning: make RedirectView.permanent=False explicit

We've been getting this warning whenever running "./manage.py runserver":

  RemovedInDjango19Warning: Default value of 'RedirectView.permanent' will change from True to False in Django 1.9. Set an explicit value to silence this warning.
    views.WhoPostcodeRedirect.as_view()

So this commit sets the value explicitly to what was happening anyway
under Django 1.8 - sending a temporary redirect (302).

DemocracyClub/yournextrepresentative,DemocracyClub/yournextrepresentative,DemocracyClub/yournextrepresentative