First simple UI for the checkout page
Every view model and service is now a singleton module
Rename 'router' to 'navigationService'
Add tests for checkout view model
Merge branch 'feature/Checkout' into feature/EnforceModulePattern

Conflicts:
	dev/scripts/checkout.js
Merge branch 'feature/EnforceModulePattern' into BasicStyling
Merge pull request #10 from CHECK24/feature/Checkout

First simple UI for the checkout page
Add stylesheet with basic styles for each view
Merge branch 'master' into BasicStyling
Merge branch 'feature/EnforceModulePattern'
Merge branch 'master' into BasicStyling