Update dependencies.

package.json

@@ -31,9 +31,9 @@
     "grunt-contrib-clean": "~0.5.0",
     "grunt-contrib-concat": "~0.3.0",
     "grunt-contrib-connect": "~0.5.0",
-    "grunt-contrib-copy": "~0.4.1",
+    "grunt-contrib-copy": "~0.5.0",
     "grunt-contrib-csslint": "~0.2.0",
-    "grunt-contrib-jshint": "~0.7.2",
+    "grunt-contrib-jshint": "~0.8.0",
     "grunt-contrib-less": "~0.8.3",
     "grunt-contrib-qunit": "~0.3.0",
     "grunt-contrib-uglify": "~0.2.7",
@@ -41,7 +41,7 @@
     "grunt-csscomb": "~1.2.1",
     "grunt-html-validation": "~0.1.12",
     "grunt-jekyll": "~0.4.0",
-    "grunt-jscs-checker": "~0.2.6",
+    "grunt-jscs-checker": "~0.3.0",
     "grunt-saucelabs": "~4.1.2",
     "grunt-sed": "~0.1.1",
     "load-grunt-tasks": "~0.2.1"