Update config to point at production data by default

We've agreed that we should develop against production data by
default. Update our config files to do this.

Also update the path to govukHost.
Merge pull request #619 from alphagov/feature/use-production-data

Update config to point at production data by default
Add prototype dashboard for tax credit renewals
Use uniquePageviews: split journey module into three

It's better to use uniquePageviews rather than sessions for the
journey module. In addition, split the journey module into three
to show the individual, dual and shared paths through the HMRC
service more clearly.