Changing Upstream to GitHub so SCSS can be included.

Currently ```http://foundation.zurb.com/files/foundation-{version}.zip``` file does not contain SCSS and limits using this webjar for any implementation that uses scss.  

Update changes the location of upstream to use ```https://github.com/zurb/foundation/archive/v{version}.zip``` which includes scss. 

This also includes a version bump to 4.2.2