ENYO-2879: make `npm test` usable on Windows

* https://enyojs.atlassian.net/browse/ENYO-2879
* Tested on Win7
* No more excuses...

Using `cmd.exe`:
```
C:\Users\fxk\Desktop\GIT\enyojs\ares-project>npm test

> ares-ide@0.2.3 pretest C:\Users\fxk\Desktop\GIT\enyojs\ares-project
> node ./scripts/test.js

> node node_modules\jshint\bin\jshint .

C:\Users\fxk\Desktop\GIT\enyojs\ares-project>
```

Using Cygwin (AKA Git Bash):
```
fxk@FIX-WIN7-X64-1 ~/Desktop/GIT/enyojs/ares-project (ENYO-2879)
$ npm test

> ares-ide@0.2.3 pretest c:\Users\fxk\Desktop\GIT\enyojs\ares-project
> node ./scripts/test.js

> node node_modules\jshint\bin\jshint .

fxk@FIX-WIN7-X64-1 ~/Desktop/GIT/enyojs/ares-project (ENYO-2879)
```

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>