traps errors in functions

avoid updating node_engine state

Iojs engine

test and implementation for always showing npm version

test and implementation for taking env vars from either the environment ...

refactor to clean up compile

test and implementation to show error on failed npm version bootstrap

split up warnings

test and implementation for skipping replacement of npm

test and implementation for skipping replacement of npm if requested version matches bundled version

New announcement

Warn old npm

more specific tests

test and implementation for dynamically-created Procfile support

run npm install even with prebuild node_modules