@davehunt 

re: downloading Jenkins every time: I tried to account for that by checking against the date of the last update in `jenkins_is_up_to_date`. Not sure if the code is up to standard, but it did the trick for me...

re: mozdownload: I started to write a download function that was pretty much copied from Scraper.download so @whimboo suggested to just use it instead. I just assumed that mozdownload comes with the package... 

I don't mind either way, but I don't have the bigger picture here, so if you two make a decision I will act on it.