[Deck] Minify Javascript

Issue Summary:

When deck is being build in Production mode, it should be configured to minify Javascript files so that they are as small as possible.

This will cut down on the initial load time of Deck.

As of Spinnaker 1.9.2, here are the script sizes that are loaded: settings.js . 2.2 KB settings-local.js 1.1 KB vendors~app.js 3.1 MB (<-- biggest offender) app.js 1.1 KB analytics.js 14.3 KB

Feature Area:

Deck