IA Vote Scraper Fixed

Iowa's vote scraper had been using the wrong Journal index web address for the last few months at least. Additionally, their PDFs no longer contained valid XML (per pdftohtml -xml), so I switched to using pdftotext; with that change I had to do a re-write of sections of the scraper.

This was per Jira ticket DATA-324.
I think we could do something like:

`//a[ends-with(@href,'.pdf')]/@href` (just wrote that offhand, not sure if that'll work or not)