Update dependencies.

Gruntfile.js

@@ -83,8 +83,14 @@ module.exports = function(grunt) {
 
     uglify: {
       options: {
-        sourceMap: true,
-        sourceMapIncludeSources: true
+        compress: true,
+        mangle: true,
+        output: {
+          comments: false
+        },
+        sourceMap: {
+          includeSources: true
+        }
       },
       plugins: {
         src: [

package.json

@@ -19,7 +19,7 @@
   },
   "private": true,
   "dependencies": {
-    "async": "~2.2.0",
+    "async": "~2.4.1",
     "body-parser": "~1.17.1",
     "compression": "~1.6.1",
     "date-utils": "~1.2.19",
@@ -28,13 +28,13 @@
     "express": "~4.15.2",
     "grunt": "~1.0.1",
     "grunt-autoprefixer": "~3.0.4",
-    "grunt-contrib-clean": "~1.0.0",
+    "grunt-contrib-clean": "~1.1.0",
     "grunt-contrib-copy": "~1.0.0",
     "grunt-contrib-less": "~1.4.0",
-    "grunt-contrib-uglify": "~2.2.0",
-    "grunt-docs": "git://github.com/gruntjs/grunt-docs.git#9c53d14c9ae4c6ffd73a4466b463dbf69ea71618",
+    "grunt-contrib-uglify": "~3.0.1",
+    "grunt-docs": "git://github.com/gruntjs/grunt-docs.git#28b81d8356f11efc4aa22a4b2d2323b20028f5f4",
     "grunt-sitemap": "~1.2.1",
-    "highlight.js": "~9.10.0",
+    "highlight.js": "~9.11.0",
     "less-plugin-clean-css": "~1.5.1",
     "lodash": "~4.17.4",
     "marked": "https://github.com/vladikoff/marked/tarball/master",