use environment variables to configure VirtualBox settings

[edf]

• borrow from approach used at Islandora Labs Vagrantfile#L7-L10
• add description to VirtualBox

[edf]

Planning to borrow heavily from Islandora-Labs/islandora_vagrant README.md and install/Vagrantfile

[nigelgbanks]

Might I suggest you borrow from the ansible repo:

https://github.com/Islandora-CLAW/claw-ansible/blob/master/Vagrantfile

It uses YAML files for configuration rather than environment variables, which I find a bit more convient for configuration and setup.

[ruebot]

We should probably have a conversation on the next call about splitting apart the repos, and creating a microservices branch on ansible. Related to #182

[edf]

YAML looks like a good approach for the next step

[ruebot]

Resolved with e86e40c

[ruebot]

@nigelgbanks you might be interest in #182