code: def provider_login_url(parser, token):
      
      bits = token.split_contents()
      provider_id = bits[1]
      params = token_kwargs(bits[2:], parser, support_legacy=False)
      return ProviderLoginURLNode(provider_id, params)
docs: {% provider_login_url "facebook" next=bla %}
      {% provider_login_url "openid" openid="http://me.yahoo.com" next=bla %}