Build: fix uglify options for uglify update

- Uses new typeofs option for compression
- See https://github.com/mishoo/UglifyJS2/issues/2198

Close gh-3710

Gruntfile.js

@@ -159,11 +159,10 @@ module.exports = function( grunt ) {
 				options: {
 					preserveComments: false,
 					sourceMap: true,
-					ASCIIOnly: true,
 					sourceMapName:
 						"dist/<%= grunt.option('filename').replace('.js', '.min.map') %>",
 					report: "min",
-					beautify: {
+					output: {
 						"ascii_only": true
 					},
 					banner: "/*! jQuery v<%= pkg.version %> | " +
@@ -171,7 +170,12 @@ module.exports = function( grunt ) {
 					compress: {
 						"hoist_funs": false,
 						loops: false,
-						unused: false
+						unused: false,
+
+						// Support: IE <11
+						// typeofs transformation is unsafe for IE9-10
+						// See https://github.com/mishoo/UglifyJS2/issues/2198
+						typeofs: false
 					}
 				}
 			}

package.json

@@ -55,7 +55,8 @@
     "sinon": "2.3.7",
     "sizzle": "2.3.3",
     "strip-json-comments": "2.0.1",
-    "testswarm": "1.1.0"
+    "testswarm": "1.1.0",
+    "uglify-js": "3.0.24"
   },
   "scripts": {
     "build": "npm install && grunt",