✨ Add umd module gereation for npm package

Signed-off-by: Jakub Juszczak <netghost03@gmail.com>

build/build.js

@@ -14,13 +14,13 @@ console.log(
   '  Opening index.html over file:// won\'t work.\n'
 )
 
-var spinner = ora('building for production...')
+var spinner = ora('building UMD module...')
 spinner.start()
 
 var assetsPath = path.join(config.build.assetsRoot, config.build.assetsSubDirectory)
 rm('-rf', assetsPath)
 mkdir('-p', assetsPath)
-cp('-R', 'static/', assetsPath)
+
 
 webpack(webpackConfig, function (err, stats) {
   spinner.stop()