Add a new sample application using Component

[mtnygard]

See Stuart Sierra's Component library for rationale and usage.

This sample also uses the new Component.repl add-on for dev workflow.

[ddeaguiar]

Alternatively, just remove vase-component.main.

[ohpauleez]

This is good to merge, unless there are more additions you want to add @mtnygard

[mtnygard]

I think it's good to go.

[ddeaguiar]

+1

[ohpauleez]

Thanks all!