Enable fingerprinting for all environments except development

Brocfile.js

var EmberApp = require('ember-cli/lib/broccoli/ember-app');

var app = new EmberApp({
  // Custom settings for broccoli-assets-rev
  // See http://www.ember-cli.com/#asset-compilation
  fingerprint: {
    enabled: true
  }
});

if (app.env == 'development') {
  app.options.fingerprint.enabled = false;
}