Allow config.json to supply environment variables as well
document how to hack new base images
MPL license - fixes #113
update base image with security updates and nodejs 0.10.24
add protect and unprotect verbs.  fixes #110
document changes in 0.6.3
bump to 0.6.3
bump to 0.6.4 after tagging and publishing 0.6.3
Merge ability to supply env vars in config.json.