Simplified caching strategy: If node_modules directory is checked into source control, rebuild any native deps. Otherwise, restore from the build cache.
Merge pull request #67 from heroku/simpler-caching

Simplified caching strategy
handle semver ranges that contain spaces
consolidate CONTRIBUTING.md into README and clean house.
add a section on legacy compatibility
Merge pull request #71 from heroku/diet

Ship the Diet Buildpack!
add empty bin/release file so as not to break things that expect it to be there
Merge pull request #72 from heroku/add-empty-release-file

add empty bin/release
DEBUGGING