Support for array of contentBase (#832)

Updated the type checking of `contentBase` for `webpack-dev-server.js` so that it can handle multiple `content-base` arguments.

Author: Telokis

bin/webpack-dev-server.js

@@ -247,7 +247,11 @@ function processOptions(wpOpt) {
 	if(options.contentBase === undefined) {
 		if(argv["content-base"]) {
 			options.contentBase = argv["content-base"];
-			if(/^[0-9]$/.test(options.contentBase))
+			if(Array.isArray(options.contentBase)) {
+				options.contentBase = options.contentBase.map(function(val) {
+					return path.resolve(val);
+				});
+			} else if(/^[0-9]$/.test(options.contentBase))
 				options.contentBase = +options.contentBase;
 			else if(!/^(https?:)?\/\//.test(options.contentBase))
 				options.contentBase = path.resolve(options.contentBase);