fix: remove unnecessary comments from video.min.js (videojs#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 videojs#3707. This also comes from the stable branch after the 5.11.9
release.

CHANGELOG.md

@@ -87,6 +87,11 @@
 * @gkatsev added tests for webpack and browserify bundling and node.js requiring ([view](https://github.com/videojs/video.js/pull/3558))
 * @rlchung fixed tests that weren't disposing players when they finished ([view](https://github.com/videojs/video.js/pull/3524))
 
+## 5.11.9 (2016-10-25)
+* 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))
+* remove sourcemap generation ([view](https://github.com/videojs/video.js/pull/3710))
+
 ## 5.11.8 (2016-10-17)
 * @misteroneill restore timeupdate/loadedmetadata listeners for duration display ([view](https://github.com/videojs/video.js/pull/3682))
 

build/grunt.js

@@ -105,6 +105,7 @@ module.exports = function(grunt) {
     uglify: {
       options: {
         preserveComments: 'some',
+        screwIE8: false,
         mangle: true,
         compress: {
           sequences: true,

package.json

@@ -74,7 +74,7 @@
     "grunt-contrib-connect": "~0.7.1",
     "grunt-contrib-copy": "^0.8.0",
     "grunt-contrib-cssmin": "~1.0.2",
-    "grunt-contrib-uglify": "~0.11.0",
+    "grunt-contrib-uglify": "^2.0.0",
     "grunt-contrib-watch": "~0.1.4",
     "grunt-coveralls": "^1.0.0",
     "grunt-fastly": "^0.1.3",