Things are getting old and creaky, and to prevent false positive on depencency scanners, we are not including the build tooling in package.json

Here's how the latest build worked out:

1. Install build dependencies:

```
npm i --save-dev \
  babel-cli \
  babel-plugin-lodash \
  babel-plugin-syntax-async-functions \
  babel-plugin-transform-regenerator \
  babel-plugin-transform-runtime \
  babel-plugin-transform-object-rest-spread \
  babel-preset-es2015 \
  rimraf
```

In case the latest of these don't work, at the last build the tags were:

```
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-plugin-lodash": "^3.3.4",
    "babel-plugin-syntax-async-functions": "^6.13.0",
    "babel-plugin-transform-object-rest-spread": "^6.26.0",
    "babel-plugin-transform-regenerator": "^6.26.0",
    "babel-plugin-transform-runtime": "^6.23.0",
    "babel-preset-es2015": "^6.24.1",
    "rimraf": "^3.0.2"
  },
```

2. `npm run build`

3. `npm pack` for a tarball