Add an alias from '@' to src (#426)

* Add an alias from '@' to src

Closes #422
This makes it easier to combine with the official webpack template

* Update vue-build

Author: posva

bin/vue-build

@@ -150,7 +150,9 @@ var webpackConfig = {
       cwd('node_modules'), // modules in cwd's node_modules
       ownDir('node_modules') // modules in package's node_modules
     ],
-    alias: {}
+    alias: {
+      '@': path.resolve('src')
+    }
   },
   resolveLoader: {
     modules: [