Revert some changes from migration challenge

Author: coderReview

.babelrc

@@ -1,9 +1,9 @@
 {
-  "presets": [
-    ["env", {
-      "targets": {
-        "node": "current"
-      }
+  "presets": ["es2015"],
+  "plugins": [
+    ["transform-runtime", {
+      "polyfill": false,
+      "regenerator": true
     }]
   ]
 }

package.json

@@ -9,16 +9,16 @@
   "scripts": {
     "lint": "./node_modules/.bin/eslint .",
     "lint:fix": "./node_modules/.bin/eslint . --fix || true",
-    "build": "babel src -d dist",
+    "build": "babel src -d dist --presets es2015",
     "sync:db": "./node_modules/.bin/babel-node migrations/sync.js",
     "sync:es": "./node_modules/.bin/babel-node migrations/elasticsearch_sync.js",
     "migrate:es": "./node_modules/.bin/babel-node migrations/seedElasticsearchIndex.js",
     "prestart": "npm run -s build",
     "start": "node dist",
-    "start:dev": "NODE_ENV=development PORT=8001 nodemon -w src --exec \"babel-node src\" | ./node_modules/.bin/bunyan",
+    "start:dev": "NODE_ENV=development PORT=8001 nodemon -w src --exec \"babel-node src --presets es2015\" | ./node_modules/.bin/bunyan",
     "test": "NODE_ENV=test npm run lint && NODE_ENV=test npm run sync:es && NODE_ENV=test ./node_modules/.bin/istanbul cover ./node_modules/mocha/bin/_mocha -- --compilers js:babel-core/register $(find src -path '*spec.js*')",
     "test:watch": "NODE_ENV=test ./node_modules/.bin/mocha -w --compilers js:babel-core/register $(find src -path '*spec.js*')",
-    "seed": "babel-node src/tests/seed.js"
+    "seed": "babel-node src/tests/seed.js --presets es2015"
   },
   "repository": {
     "type": "git",
@@ -63,7 +63,9 @@
     "babel-cli": "^6.9.0",
     "babel-core": "^6.11.4",
     "babel-eslint": "^7.1.1",
-    "babel-preset-env": "^1.7.0",
+    "babel-plugin-add-module-exports": "^0.2.1",
+    "babel-plugin-transform-runtime": "^6.23.0",
+    "babel-preset-es2015": "^6.9.0",
     "bunyan": "^1.8.1",
     "chai": "^3.5.0",
     "eslint": "^3.16.1",