dont install devDependencies
add license
add unit tests
prettify
consistency
remove caching
test that nothing is cached
add a warning of no version of node.js specified in package.json
update changelog
don't let semver failures abort the whole buildpack
echo errors to stderr
fix error assertions
add test for invalid engine version
give the download url to vulcan directly
add a warning about default version tracking
add profile support
need to export path
escape /Users/david/.rbenv/shims:/Users/david/.rbenv/bin:/usr/local/share/python:/Users/david/.nvm/v0.6.10/bin:/Users/david/.bash/bin:/usr/local/bin:/usr/local/sbin:/Users/david/.bin:/usr/bin:/bin:/usr/sbin:/sbin
use $HOME to build $PATH
call it profile.d