fix miss devDeps

close cnpm/npminstall#64

package.json

@@ -102,6 +102,7 @@
     "extract-text-webpack-plugin": "^1.0.1",
     "gh-pages": "^0.11.0",
     "gsap": "^1.18.2",
+    "highlight.js": "^9.2.0",
     "history": "^1.17.0",
     "instantclick": "^3.1.0",
     "jest-cli": "~0.8.0",