fix: remove unnecessary comments from video.min.js (#3709)

This involves updating to latest version of uglify and setting
"screwIE8" to false since that is a default in 2.7. However, this makes
"preserveComments" "some" work as it is supposed to work.

Fixes #3707

CHANGELOG.md

@@ -2,7 +2,8 @@ CHANGELOG
 =========
 
 ## HEAD (Unreleased)
-_(none)_
+* greenkeeper updated karma dependencies ([view](https://github.com/videojs/video.js/pull/3523))
+* update to latest uglify to fix preserve comments issue. Disable screw ie8 option. ([view](https://github.com/videojs/video.js/pull/3709))
 
 --------------------
 

build/grunt.js

@@ -128,6 +128,7 @@ module.exports = function(grunt) {
         sourceMapIn: 'build/temp/video.js.map',
         sourceMapRoot: '../../src/js',
         preserveComments: 'some',
+        screwIE8: false,
         mangle: true,
         compress: {
           sequences: true,

package.json

@@ -59,28 +59,29 @@
     "grunt-contrib-cssmin": "~0.6.0",
     "grunt-contrib-jshint": "~0.11.3",
     "grunt-contrib-less": "~0.6.4",
-    "grunt-contrib-uglify": "~0.11.0",
+    "grunt-contrib-uglify": "^2.0.0",
     "grunt-contrib-watch": "~0.1.4",
     "grunt-coveralls": "^1.0.0",
     "grunt-exorcise": "^1.0.1",
     "grunt-fastly": "^0.1.3",
     "grunt-github-releaser": "^0.1.17",
-    "grunt-karma": "^0.8.3",
+    "grunt-karma": "^2.0.0",
+    "grunt-shell": "^1.3.0",
     "grunt-version": "~0.3.0",
     "grunt-videojs-languages": "0.0.4",
     "grunt-zip": "0.10.2",
-    "karma": "^0.12.36",
-    "karma-browserify": "^4.0.0",
-    "karma-browserstack-launcher": "^0.1.4",
-    "karma-chrome-launcher": "^0.1.3",
-    "karma-coverage": "^0.4.0",
-    "karma-detect-browsers": "^2.0.2",
-    "karma-firefox-launcher": "^0.1.3",
-    "karma-ie-launcher": "^0.1.5",
-    "karma-opera-launcher": "~0.1.0",
-    "karma-qunit": "^0.1.2",
-    "karma-safari-launcher": "^0.1.1",
-    "karma-sinon": "^1.0.3",
+    "karma": "^1.2.0",
+    "karma-browserify": "^5.1.0",
+    "karma-browserstack-launcher": "^1.0.1",
+    "karma-chrome-launcher": "^1.0.1",
+    "karma-coverage": "^1.1.1",
+    "karma-detect-browsers": "^2.1.0",
+    "karma-firefox-launcher": "^1.0.0",
+    "karma-ie-launcher": "^1.0.0",
+    "karma-opera-launcher": "^1.0.0",
+    "karma-qunit": "^1.2.0",
+    "karma-safari-launcher": "^1.0.0",
+    "karma-sinon": "^1.0.5",
     "load-grunt-tasks": "^3.1.0",
     "proxyquireify": "^3.0.0",
     "qunitjs": "^1.18.0",