Move babel presets to .babelrc

.babelrc

@@ -0,0 +1,6 @@
+{
+  "presets": [
+    "es2015",
+    "stage-0"
+  ]
+}

config/server.js

@@ -16,3 +16,5 @@ router(app)
 app.listen(config.port, () => {
   console.log(`Server started on ${config.port}`)
 })
+
+export default app

index.js

@@ -1,8 +1,3 @@
-require("babel-core/register")({
-  "presets": [
-    "es2015",
-    "stage-0"
-  ]
-});
+require("babel-core/register")();
 require("babel-polyfill");
 require('./config/server.js');