increasing setup personalization and flexibility.
increasing setup personalization and flexibility (v2)
do not enforce box version (used scheme was tied to yunsang/coreos-*) per upstrem's review
do not trim spaces at EOL per upstreams' request.
keep allowing the ip addr ranges to also be set via an env var for backward compatibility.
drop tentative support for vmware fusion, per upstreams' review comments.
tweak makefile, preserving previous behaviour, per ongoing review ...
channel -> box, per review comments
making sure that setting stuff via env vars actually works.
Remove a space
Merge branch 'refs/heads/AntonioMeireles-increase_personalization'