ENYO-3469: update enyo/tools npm dependency (install --prod version)

this commit is the result of the following sequence of operation, to both
update the dependencies but also strip all of the development/test data that
come with those dependencies:

```
$ cd tools
$ npm remove nopt
$ npm remove shelljs
$ npm install --prod nopt
$ npm install --prod shelljs
$ npm ls
```

...and update enyo/package.json accordingly

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>