try reading new env-file param
debug
don't forget those utility functions
subshell
bashin
experiment
experiment
experiment
I suck at git
Fix the new envfile tests. Thanks @tt
Merge pull request #89 from heroku/env-file

Make config vars available to npm install
update compile script to work with new buildpack-env-dir API
update buildpack-env-dir tests
Cache everything one level deeper (inside $cache_dir/node) to avoid clobbering cached artifacts from other buildpacks.
Store node-version textfile in new .heroku directory, in the slug _and_ the cache.
Merge pull request #94 from heroku/clever-ponies-um

update compile script to work with new buildpack-env-dir API
Merge pull request #95 from heroku/namespaced-cache

Namespaced caching and node runtime version tracking
Pull in new env-var handling from upstream master
Env vars now load the new way for our grunt build process