scripts: Avoid 'weird errors' from numeric codes

Regression introduced by transition to spawn from utils/exec.js
fstream-npm@0.1.6
cmd-shim@1.1.1
editor@0.0.5
once@1.3.0
ansi@0.2.1
housekeeping: cleanup tests
Fix test for outdated-new-versions in edge cases

Make the tests independent from the order of the data-Array which
differs when I run the single test

Fix tests which clean cache:

I also added a separate cache-directory so the test does not
poison the normal cache of npm.

fixes #3948
Fix npm repo error for unnormalized shorthand urls

New npm versions are supporting the shorthand username/repo
in the repository field of the package.json - but sometimes
people with old npm versions are publishing them and they
do not get normalized.

Fixes #3952
let npm.commands.uninstall() return an array of removed items

Fixes #1754
npmlog@0.0.5
npm-registry-mock@0.5.3
npmlog@0.0.6
various minor dep updates
npmconf update
v1.3.12