New slimmer fixes failing javascript tests.
New slimmer fixes failing javascript tests.

There's a fixture for the 'wrapper' template which is used
when running tests. This hadn't been updated to included the core.js
file, and so smart answer's javascript tests were failing.

The new slimmer updates the fixture to include core.js.

aledelcueto/smart-answers,tadast/smart-answers,ministryofjustice/smart-answers,alphagov/smart-answers,aledelcueto/smart-answers,tadast/smart-answers,stwalsh/smart-answers,alphagov/smart-answers,keithiopia/smart-answers,lutgendorff/smart-answers,tadast/smart-answers,ministryofjustice/smart-answers,askl56/smart-answers,lutgendorff/smart-answers,askl56/smart-answers,aledelcueto/smart-answers,ministryofjustice/smart-answers,askl56/smart-answers,alphagov/smart-answers,lutgendorff/smart-answers,stwalsh/smart-answers,stwalsh/smart-answers,aledelcueto/smart-answers,tadast/smart-answers,askl56/smart-answers,keithiopia/smart-answers,alphagov/smart-answers,lutgendorff/smart-answers,stwalsh/smart-answers,keithiopia/smart-answers