Roll back superstatic to 3.x, 4.x breaks configuration

Author: developit

package.json

@@ -45,7 +45,7 @@
     "postcss-loader": "^0.8.0",
     "raw-loader": "^0.5.1",
     "source-map-loader": "^0.1.5",
-    "superstatic": "^4.0.1",
+    "superstatic": "^3.0.0",
     "url-loader": "^0.5.7",
     "webpack": "^1.12.11",
     "webpack-dev-server": "^1.14.1"