Auto-register Vue components

[jakedohm]

TLDR

Components in src/js/components should be auto-registered into Vue, so you don't have to manually import each component.

Spec

• Components in src/js/components and all subfolders will be automatically registered
• Component name will match the filename. Button.vue becomes <Button>
  • Note: this will require the developer to make sure they don't name two components exactly the same, which I'm fine with.
• Lazy loading: If some components aren't required on page-load, we should be able to lazy load them. To lazy load a component, you name the file ComponentName.lazy.vue

This also will take care of #25.