fix(CI): resolve CI blockers using NPM LTS (#1354)
fix(CI): resolve CI blockers using NPM LTS (#1354)

There was an issue with npm@5.4.0 running some of the post-install scripts that was causing the CI to fail.

Fixes #1315
lbochenek/react-native-windows,lbochenek/react-native-windows,lbochenek/react-native-windows,lbochenek/react-native-windows