Fixes bug 965446 - fix silent ftpscraping errors
* Use correct variable for descending into release directories
* Update test to use full path into directory
* Update test for >27.0 versions of Firefox for final beta
* Pass all the important variables to add_new_release()
Merge pull request #1841 from selenamarie/bug965446-ftpscraper-hotfix

Fixes bug 965446 - fix silent ftpscraping errors