summary.js import statements causing error

The import statements in the summary.js causing error:

```
import _ from 'lodash'
import Tokenizer from 'sbd'
import request from 'request'
```

```
(function (exports, require, module, __filename, __dirname) { import _ from 'lodash'
                                                              ^^^^^^
SyntaxError: Unexpected token import
```

node version: v6.11.1