Add dashboards for SORN and tax-disc
Fix stub controller config and syntax in stub response

@jcbashdown, @gtrogers
Add dashboards for sorn and tax-disc
@wip Remove failures and availability from overview page, cucumber failing
Update feature tests for vehicle licensing dashboards
Rename many things from excise duty to licensing
Merge branch 'sorn-and-tax-disc-dashboards' into application-over-time-module

Conflicts:
	app/assets/javascripts/vehicle-excise-duty/controllers/overview.js
	app/views/vehicle-excise-duty/index.html.erb
	features/vehicle-excise-duty/dashboard.feature