copy watchOptions from webpack options

Author: sokra

bin/webpack-dev-server.js

@@ -67,6 +67,10 @@ if(!options.filename)
 [].concat(wpOpt).forEach(function(wpOpt) {
 	wpOpt.output.path = "/";
 });
+if(!options.watchOptions)
+	options.watchOptions = firstWpOpt.watchOptions;
+if(!options.watchDelay && !options.watchOptions) // TODO remove in next major version
+	options.watchDelay = firstWpOpt.watchDelay;
 if(!options.hot)
 	options.hot = argv["hot"];