alphagov/static — pull request #291 by alext (2013-07-23 13:24:20+00:00)
Title:  Fix redirects for apple-touch icons

We were redirecting to non-existent assets for /apple-touch-icon.png and
/apple-touch-icon-precomposed.png. This started to fail noisily since
alphagov/static#289 was merged.

Add an override to redirect them to an asset that does exist. Also added
tests to ensure that the targets exist.