Preserve ENV vars CPATH and CPPPATH (composable buildpacks)
default to latest versions of node and npm
choose default version using semver
update to node 0.10
Merge pull request #31 from heroku/update_default_versions

default to latest versions of node and npm
cat npm-debug.log on exit
Merge pull request #34 from ryanbrainard/cat-npm-debug-log

Cat npm-debug.log on exit
add CONTRIBUTING.md
remove extra newline
update 'no version specified' devcenter url
Merge pull request #30 from davidjrice/preserve-env-vars

Preserve ENV vars CPATH and CPPPATH (composable buildpacks)
improve documentation in README
add a readme section for hackers
DRY up the hacking docs
ignore .DS_Store
use npm 1.3.x by default
slash and burn
move .profile.d stuff to .profile.d
move helpers to their own file
add json.sh