Merge pull request heroku#107 from heroku/remove-npm-cert-workaround

npm reverted to a backwards compatible cert

Merge pull request heroku#102 from rwonly/fixpath

the specified node runtime should be prior in the path

Merge pull request heroku#98 from heroku/npm-cert-bug

npm cert bug

Merge pull request heroku#95 from heroku/namespaced-cache

Namespaced caching and node runtime version tracking

Merge pull request heroku#94 from heroku/clever-ponies-um

update compile script to work with new buildpack-env-dir API

give the download url to vulcan directly

update changelog

get rid of spaces after comparison operators to avoid them being trea…

…ted as separate requirements

bump npm version

Merge remote-tracking branch 'origin/versions'