Bump remote api v1.9

@bfulton 

* Bump the remote API version to `1.9`
* More gracefully handling `Docker::Image#insert`
* Separated the JSON fixing into `Docker::Util#fix_json`
* Re-record the VCRs
* Send the `X-Registry-Config` header along with `X-Registry-Auth`, see the [API docs](http://docs.docker.io/en/latest/reference/api/docker_remote_api_v1.9/#build-an-image-from-dockerfile-via-stdin)