Release 4.7

This is a tracking issue for release 4.7.

I am trying to give better visibility for upcoming changes and so am trying out making a PR for a release here, pulling from the official next release branch into master. This allows for the current pending changes to be easily visible.

**Please keep feature requests in their own issues**

I'm also leaving this PR unlocked so people can make comments/etc. and we'll see how it goes :) If you want to make a comment on a particular change, please make the comment in the "Files changed" tab so comments are not lost during a rebase.

List of changes for release:
- [x] Add Korean documentation #2242 #2244
- [x] Deprecate `res.send(status, body)` format #2227
- [x] Fix errors/hangs sending 500/404 if request had body https://github.com/expressjs/finalhandler/commit/00633b4186ca4d7f6ca91d5c8c04db7bddd8ec24
- [x] Fix `req.protocol` for proxy-direct connections #2252
- [x] Make `req.query` parsing configurable #2215

**Testing this release**

If you want to try out this release, you can install it with the following command:
```bash
$ npm install visionmedia/express#4.7
```

You can also directly reference it in your `package.json`:
```
"dependencies": {
  "express": "visionmedia/express#4.7"
}
```

Owners/collaborators: please do not merge this PR :)