Revert the version of the toolkit, plus a bit

b549e37 updated it to a recent version. 5424d51 accidentally undid that.

This change reverts 5424d51, plus goes all the way to bleeding edge
since we should try to dogfood as much as possible.
Merge pull request #481 from alphagov/fix-toolkit

Revert the version of the toolkit, plus a bit
CSS should be compiled as part of travis build

Toolkit usage was broken recently and this wasn’t picked up when the
change happened.