Docker 1.0 renamed container as Container

This solves the following error:
```
$ bash -ex build.sh
[...]
++ sudo docker inspect -f '{{ .container }}' dogestry
+ id='<no value>'
+ sudo docker cp '<no' 'value>:dogestry' .

Usage: docker cp CONTAINER:PATH HOSTPATH

Copy files/folders from the PATH to the HOSTPATH

```