Update slimmer (adds report a problem)
missing assets entry
fixing layout to not to fail if there is no trade tariff updates
do not show last updated div if no updates present
Merge pull request #151 from bitzesty/empty-database-fix-rebased

frontend shouldn't fail if no tariff updates loaded yet
Update slimmer to version which fixes missing metaviewport tag

Once slimmer is bumped up a version we can use the released version
Merge pull request #148 from alphagov/report-a-problem

Update slimmer (adds report a problem)