give the test apps consistent package.json names so nomnom can ignore them
pass engines.node to node-semver-service.heroku.com
rebuild, then install. fixes #47
bump stable to 0.10.20
use semver.io for great success
all tests passing; feature parity with diet, plus new server pro-tips
improve build output; all tests passing again
fix conflicts
Merge pull request #53 from heroku/use-semver-service

Use semver.io
use pipefail to force exit when `npm install` fails.
When restoring from cache, run `npm install` to ensure pre- and post-install scripts are run.
Merge pull request #56 from heroku/pipefail

use pipefail to force exit when `npm install` fails.
Merge pull request #57 from heroku/run-hooks

Ensure npm scripts are run after restoring cache
merged in release script