Added Release archive to WebJar

Hi James,

As per your suggestion in #6, I have updated the WebJar so that it includes the Foundation release archive (in addition to the source archive). This allows users to access both the SASS files and the CSS files (since Foundation doesn't provide an archive that has both versions).

Complete tree of the WebJar will look like this:
```
|-webjars
   |---foundation
   |-----5.0.2
   |-------css
   |-------img
   |-------js
   |---------foundation
   |---------vendor
   |-------scss
   |---------foundation
   |-----------components
```

Cheers,
Dhruv