charmbits: factor service out of http

This had quite a few knock on effects:

update TODO.md

charmbits/http: remove service parts

hook: add RegisterMainHooks; remote special casing for stop; add "*" hook

cmd/gocharm: call hook.RegisterMainHook, use slice for hooks in inspect.

update goyaml dep to version that produces nice yaml output.

update concat example for changes.

update dependencies.tsv