route.payload.allow as Array never matches

[seanmonstar]

payload: {
  allow: ['application/json', 'image/jpeg']
}

This will never match json nor jpeg. The if check in payload.js wrongly evaluates to true, since payload.allow !== mime, as it is an array.

https://github.com/spumko/hapi/blob/master/lib/payload.js#L66-L68

Noticed there also wasn't a test in unit or integration for when payload.allow is an array.