added preferGlobal to package.json

cherry picked from commit 056f65c8e74e5ef979034f6b2ea2cf1855195a3c
Added header to enable IE support via Chrome Frame

cherry picked from commit c97ca6ceb8c87b98d22a9efb69edbd2935c8f54c
Replaced paperboy with express.
Moved frontend overrides out of front-end folder

Moved front-end/node/Overrides.js out of front-end folder, so that it is
easier to pull new versions of front-end from Blink DevTools.