[bug] bootstrap CSS older than bootstrap LESS

In 7580a3592208 the bootstrap less files were updated to bootstrap 2.3.1. However, in https://github.com/tangentlabs/django-oscar/blob/master/oscar/templates/oscar/dashboard/layout.html?source=cc#L11 a minified bootstrap css is used that wasn't updated in 7580a3592208.

I'm thinking that the intention is for bootstrap 2.3.1 to be used.