Add new icons and CSS for them
Add black icon for external links column heading

Currently only used on Trade Tariff
Sprite new external link images & rename old
Move external link CSS out to toolkit
Move external link images to toolkit
Split out font size from default mixin
Update toolkit to get external link mixins
Remove unused images
Add CSS for next steps promo box
Add new button format
Add images for button arrow

Includes a fix for the related links box when it
has no category.
Add the cookie functions to the header footer js

This was removed from `welcome.js` in aafedc98 but wasn't added to the
header footer. There really needs to be a proper refactor of the way we
do cookies but this should be enough to get rid of the errors we are
seeing at the moment.
Merge pull request #205 from alphagov/cookie-functions

Add the cookie functions to the header footer js
Merge pull request #203 from alphagov/external-links-update

External links update
ADding an empty template to test barclays thing
Merge branch 'payments-templates' of github.com:alphagov/static
Checking for ruby magic
Put travel-advice live (allow Google et al. in)
More Barclay's fun. Sorry.
Set external links in tables to match font-size