2.4.0

2.4.0 - 2017-08-18

Server

• Moves Apollo client and Redux store to Koa ctx middleware, so it's available to all routes
• Adds config.addMiddleware(), to add custom middleware to the Koa server

## App

• Adds sample Powered-By header, to showcase custom middleware
• Adds ctx.store.getStore() dump to sample /test and 404 routes, to show the difference in Apollo response