ENYO-2458: update node.js version advice & URL

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>
Merge pull request #335 from enyojs/ENYO-2458

ENYO-2458: update node.js version advice & URL
Merge remote-tracking branch 'upstream/master' into Work
work on updating hera
more work on updating