Fix jenkins.sh

this hadn't been setup properly.

I prefer to define the default task in the top-level Rakefile rather
than having lib/tasks/*.rake add themselves so that the order of
execution can be controlled.
Fix SpecialistDocumentsHelper spec
Fix cucumber feature

The content api response fixture was completely out of sync with
reality.
Run slimmer in test mode in cucumbers

In test mode slimmer uses a fixture for the header/footer instead of
attempting to load the real templates over the network.
Remove unnecessary route
Add new lines to ends of files
Merge pull request #5 from alphagov/fix-jenkins-script

Fix jenkins script