Use a custom ESLint rule list (#27)

* Use a custom eslint rule list

* Sort rules

* Relax some rules

config/babel.dev.js

@@ -0,0 +1,14 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+module.exports = {
+  cacheDirectory: true,
+  presets: ['es2015', 'es2016', 'react'],
+  plugins: ['transform-object-rest-spread']
+};