update uglify opts, transform unicode to ascii

webpack.config.min.js

@@ -7,7 +7,11 @@ var config = require("./webpack.config.js");
 
 config.plugins = [
   new ExtractTextPlugin('[name].min.css'),
-  new webpack.optimize.UglifyJsPlugin()
+  new webpack.optimize.UglifyJsPlugin({
+    output: {
+      ascii_only: true
+    }
+  })
 ];
 config.output.filename = config.output.filename.replace(/\.js$/, ".min.js");
 delete config.entry.demo;