Prune any past devDependencies, if present in cache

If the --production flag is specified, this command will remove the packages specified in your devDependencies.

https://www.npmjs.org/doc/cli/npm-prune.html
show status when unsetting git dir
status needs to go after source
Merge pull request #127 from hunterloftis/fixbower-status

Fixbower status
Merge pull request #115 from kuba-kubula/patch-1

Prune any past devDependencies, if present in cache
add instructions for npm@next
Merge branch 'master' of github.com:heroku/heroku-buildpack-nodejs
typo
chore(README): Fix npm@next buildpack url
Merge pull request #145 from aeby/patch-1

chore(README): Fix npm@next buildpack url
update readme for npm next
Merge pull request #146 from heroku/link-to-yoga

update npm next readme
Merge pull request #1 from heroku/master

Update from upstream