Add some additional asset URLs

Internally, BIS were redirecting from:
http://www.bis.gov.uk/assets/bispartners/cicregulator/*
to:
http://www.bis.gov.uk/assets/cicregulator/*

This means that users could have a link to either form, so we need to
provide a mapping to either form.
Merge pull request #420 from alphagov/additional_cic_regulator_asset_urls

Add some additional asset URLs