fixed a bug in export script

Author: joshwnj

package.json

@@ -19,7 +19,7 @@
   },
   "scripts": {
     "build-example": "browserify -t ./lib/local-css -o example/dist/index.js example/index.js",
-    "export-css": "browserify -t ./lib/local-css src/export-css.js | node",
+    "export-css": "browserify -t ./lib/local-css example/export-css.js | node",
     "publish-gh-pages": "npm run build-example && ./bin/publish-gh-pages",
     "test": "echo \"Error: no test specified\" && exit 1"
   },