Remove overriding output.path to "/" when using CLI

The assignment was originally to enforce linux style paths, because the prev versions of memory-fs doesn't support windows style paths.
But as it supports it now it should be fine to remove this.

Ref #337

Author: SpaceK33z

bin/webpack-dev-server.js

@@ -161,9 +161,6 @@ function processOptions(wpOpt) {
 		options.outputPath = "/";
 	if(!options.filename)
 		options.filename = firstWpOpt.output && firstWpOpt.output.filename;
-	[].concat(wpOpt).forEach(function(wpOpt) {
-		wpOpt.output.path = "/";
-	});
 
 	if(!options.watchOptions)
 		options.watchOptions = firstWpOpt.watchOptions;