narumincho-vdom 改善

[narumincho]

現状 App<state>

• initial_state(fire)→state
• render(state)→vdom
• on_navigate(state,url)→state

変更後 App<state, location>

• initial_state(url)→(state,Option<location>)
• location_to_url(location)→url
• client_initial(state,fire)→()
• render(state)→vdom
• on_navigate(location,url)→state