4.2.0

• adds LOCAL_STORAGE_KEY to .env, to allow saving/retrieving MobX store state to localStorage on the client
• adds schema/schema.graphql, with sample schema for Hacker News stories
• refactors <StateConsumer> as new withStore() HOC in @/lib/store.ts
• refactors <HackerNews> example to use the new auto-generayed <GetHackerNewsTopStories.Component>
• removes default exports in example components
• fixes #150 - React-Hot-Loader 4.7
• renames @/data/state.ts -> @/data/store.ts (now exports Store class)
• adds autosave and new rehydrate funcs in @/lib/store.ts, for saving and retrieving MobX state to/from localStorage
• refactors @/entry/client.tsx with new MobX store hydration/auto-save
• refactors @/entry/server.tsx with new MobX store
• adds auto-generated @/graphql/index.tsx with query and HOC for getting top HackerNews stories
• removes previous @/lib/mobx.ts
• fixes static runner; removes koa2-history-api-fallback package in favour of a local function
• adds HOST to .env and common.host in runner to allow binding to non-localhost
• adds react-dom alias to Webpack common config, to use @hot-loader/react-dom
• renames __APOLLO_STATE__ -> __APOLLO__, for Apollo GraphQL rehydration on the client
• passes per-request store to createClient(), for use-cases where store data is needed inside GraphQL requests (JWTs, etc)