Update dependencies.

Gruntfile.js

@@ -210,7 +210,9 @@ module.exports = function (grunt) {
     uglify: {
       options: {
         banner: '<%= banner %>',
-        // compress: true,
+        compress: {
+          warnings: false
+        },
         mangle: true,
         preserveComments: false
       },

package.json

@@ -27,25 +27,25 @@
   },
   "devDependencies": {
     "grunt": "~0.4.5",
-    "grunt-autoprefixer": "~2.2.0",
+    "grunt-autoprefixer": "~3.0.0",
     "grunt-banner": "~0.3.1",
     "grunt-contrib-clean": "~0.6.0",
     "grunt-contrib-concat": "~0.5.1",
-    "grunt-contrib-connect": "~0.9.0",
+    "grunt-contrib-connect": "~0.10.1",
     "grunt-contrib-copy": "~0.8.0",
     "grunt-contrib-csslint": "~0.4.0",
     "grunt-contrib-cssmin": "~0.12.2",
-    "grunt-contrib-jshint": "~0.11.1",
+    "grunt-contrib-jshint": "~0.11.2",
     "grunt-contrib-sass": "~0.9.2",
-    "grunt-contrib-uglify": "~0.8.1",
+    "grunt-contrib-uglify": "~0.9.1",
     "grunt-contrib-watch": "~0.6.1",
     "grunt-csscomb": "~3.0.0",
-    "grunt-html": "~4.0.2",
+    "grunt-html": "~4.0.3",
     "grunt-jekyll": "~0.4.2",
     "grunt-jscs": "~1.6.0",
     "grunt-sed": "~0.1.1",
     "load-grunt-tasks": "~3.1.0",
-    "time-grunt": "~1.1.0"
+    "time-grunt": "~1.1.1"
   },
   "engines": {
     "node": ">=0.10.1"