Update django_countries to latest release

Signed-off-by: Dan McGee <dan@archlinux.org>
Use cache_page on mirror status JSON

Signed-off-by: Dan McGee <dan@archlinux.org>
Remove old suggested recommended settings

Signed-off-by: Dan McGee <dan@archlinux.org>
Fix 500 when no URLs have been checked

Signed-off-by: Dan McGee <dan@archlinux.org>
Fix error when viewing mirror with no active URLs

Signed-off-by: Dan McGee <dan@archlinux.org>