rename _assets to assets

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assets/build/vue-loader.conf.js

@@ -0,0 +1,12 @@
+var utils = require('./utils')
+var config = require('./config')
+var isProduction = process.env.NODE_ENV === 'production'
+
+module.exports = {
+  loaders: utils.cssLoaders({
+    sourceMap: isProduction
+      ? config.build.productionSourceMap
+      : config.dev.cssSourceMap,
+    extract: isProduction
+  })
+}