Remove duplicate dependency.

package.json

@@ -47,8 +47,8 @@
     "grunt-contrib-qunit": "~0.4.0",
     "grunt-contrib-uglify": "~0.4.0",
     "grunt-contrib-watch": "~0.5.3",
-    "grunt-css-flip": "^0.1.0",
     "grunt-csscomb": "~2.0.1",
+    "grunt-css-flip": "^0.1.0",
     "grunt-exec": "~0.4.5",
     "grunt-html-validation": "~0.1.13",
     "grunt-jekyll": "~0.4.1",
@@ -56,8 +56,7 @@
     "grunt-saucelabs": "~5.0.1",
     "grunt-sed": "~0.1.1",
     "load-grunt-tasks": "~0.4.0",
-    "markdown": "~0.5.0",
-    "css-flip": "~0.3.0"
+    "markdown": "~0.5.0"
   },
   "engines": {
     "node": "~0.10.1"