use docker for development

see [README](https://github.com/bitzesty/content-planner/blob/ab7222bdc1aa15acef38abd829a5dc543bae3287/README.md#development-via-vagrant-and-docker)
Ideally we replace the config and keep the original as that's known to
work.
On 21 Jul 2014 01:03, "Mario Andrés" <notifications@github.com> wrote:

> In config/database.yml:
>
> > @@ -23,3 +24,4 @@ test:
> >    pool: 5
> >    username: content_planner
> >    password: content_planner
> > +  host: db
>
> @matthewford <https://github.com/matthewford> will it work like this ^?
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/bitzesty/content-planner/pull/1/files#r15152890>.
>