Update node dependencies.

package.json

@@ -38,7 +38,7 @@
     "grunt-contrib-clean": "~0.6.0",
     "grunt-contrib-concat": "~0.5.0",
     "grunt-contrib-connect": "~0.8.0",
-    "grunt-contrib-copy": "~0.6.0",
+    "grunt-contrib-copy": "~0.7.0",
     "grunt-contrib-csslint": "~0.3.1",
     "grunt-contrib-cssmin": "~0.10.0",
     "grunt-contrib-jade": "~0.13.0",
@@ -51,12 +51,12 @@
     "grunt-exec": "~0.4.6",
     "grunt-html-validation": "~0.1.18",
     "grunt-jekyll": "~0.4.2",
-    "grunt-jscs": "~0.7.1",
+    "grunt-jscs": "~0.8.0",
     "grunt-saucelabs": "~8.3.2",
     "grunt-sed": "~0.1.1",
-    "load-grunt-tasks": "~0.6.0",
+    "load-grunt-tasks": "~1.0.0",
     "markdown": "~0.5.0",
-    "npm-shrinkwrap": "~3.1.8",
+    "npm-shrinkwrap": "~4.0.0",
     "time-grunt": "~1.0.0"
   },
   "engines": {