Issue downloading NWJS with Kinetic

[dcconner]

Trying to run the nwjs_install on an older Kinetic 16.04 setup, and the script silently failed due to a curl error .

My colleague @jbabilino fixed by modifying bin/nwjs_install and adding -v -k options:

NWJS_URL="https://dl.nwjs.io/$VERSION/nwjs-$VERSION-$OS-$ARCH.tar.gz"
echo "Downloading nwjs from $NWJS_URL"
curl -v -k -s -o $TEMPFILE $NWJS_URL

The -k option allows insecure SSL connections, which is obviously less than ideal.
The -v option just specified verbose output

Noting this here for now, but will not commit with insecure option until I test on Melodic and Noetic systems.