Merge pull request #9537 from edx/feanil/upgrade_uglify

Upgrade uglify-js to 2.4.24

package.json

@@ -3,7 +3,7 @@
   "version": "0.1.0",
   "dependencies": {
     "coffee-script": "1.6.1",
-    "uglify-js": "2.4.15"
+    "uglify-js": "2.4.24"
   },
   "devDependencies": {
     "jshint": "^2.7.0"