Developer setup instructions on Mac

[redshiftzero]

Running through the dev setup instructions on Mac OS X: following the instructions in the Readme with Ansible version 2.1.1.0 and Vagrant 1.8.5, I run into a bump at make dev:

$ make dev
make ansible
ansible-galaxy install -r ansible/requirements.yml -p ansible/roles
- downloading role 'nodejs', owned by geerlingguy
- downloading role from https://github.com/geerlingguy/ansible-role-nodejs/archive/4.0.0.tar.gz
- extracting geerlingguy.nodejs to ansible/roles/geerlingguy.nodejs
- geerlingguy.nodejs was installed successfully
vagrant up --provision
Bringing machine 'securethenews' up with 'docker' provider...
==> securethenews: Box 'debian/contrib-jessie64' could not be found. Attempting to find and install...
    securethenews: Box Provider: docker
    securethenews: Box Version: >= 0
==> securethenews: Loading metadata for box 'debian/contrib-jessie64'
    securethenews: URL: https://atlas.hashicorp.com/debian/contrib-jessie64
The box you're attempting to add doesn't support the provider
you requested. Please find an alternate box or use an alternate
provider. Double-check your requested provider to verify you didn't
simply misspell it.

If you're adding a box from HashiCorp's Atlas, make sure the box is
released.

Name: debian/contrib-jessie64
Address: https://atlas.hashicorp.com/debian/contrib-jessie64
Requested provider: [:docker]
make: *** [dev] Error 1

Trying to pop off again again after setting VAGRANT_DEFAULT_PROVIDER to virtualbox:

$ make dev
make ansible
ansible-galaxy install -r ansible/requirements.yml -p ansible/roles
- geerlingguy.nodejs is already installed, skipping.
vagrant up --provision
Bringing machine 'securethenews' up with 'virtualbox' provider...
There are errors in the configuration of this machine. Please fix
the following errors and try again:

vm:
* A box must be specified.

make: *** [dev] Error 1

[garrettr]

Thanks for spotting this ahead of the open source release! :sweat_smile: