Creating data on a path with a period `.` doesn't explode properly


```
curl -i -X POST https://jsonbin.org/remy/blog.v2 \
     -H "authorization: token $TOKEN" -d '{ url: "https://remysharp.com" }' \
     -H 'content-type: application/json'
HTTP/2 201
```

But this makes:

```json
{
  "blog.v2": {}
}
```

When it should make:

```json
{
	"blog": {
		"v2": {
			"url": "…"
		}
	}
}
```

Also prevents delete etc because the path is hosed.