Cannot find module 'await-busboy'
In the last commit, some changes have been made but it brokes the router. The dependency `await-busboy` doesn't exist. I used Node v7.0.0 with `--harmony` flag and I ran `npm install` twice.

Thanks for the amazing work on this repository!

```
node --harmony server.js
module.js:474
    throw err;
    ^

Error: Cannot find module 'await-busboy'
    at Function.Module._resolveFilename (module.js:472:15)
    at Function.Module._load (module.js:420:25)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/Users/aurelien/repositories/strapi/packages/strapi/node_modules/koa-joi-router/joi-router.js:9:16)
    at Module._compile (module.js:573:32)
    at Object.Module._extensions..js (module.js:582:10)
    at Module.load (module.js:490:32)
    at tryModuleLoad (module.js:449:12)
    at Function.Module._load (module.js:441:3)
    at require (internal/module.js:20:19)
```