Update node version and dependencies.
Review Request #7862 — Created Jan. 12, 2016 and submitted
Sonar was running with a very old node engine, which had some vulnerabilities.
This change updates to the latest stable node release and also bumps our
backend package dependencies to the latest versions.
Flipped through the various pages and saw that everything worked as expected.
Tool: Pyflakes Ignored Files: package.json Tool: PEP8 Style Checker Ignored Files: package.json