New OIG scraper for Eximbank
Rewrite Eximbank OIG scraper

Sometimes reports are separated by one <p> tag closing and another <p> tag
opening, which is fine, but other times reports are separated by <br><br>
inside of a <p> tag, at arbitrary depths in the parse tree.

To handle this, we look at each <p>'s subtree separately, collecting text
and links piece by piece until we hit a <br><br>, and start looking for a
new report.
Fix file permissions
More work on the Ex-im OIG scraper
More fixes to Ex-im OIG scraper, now finishes run
Merge pull request #28 from divergentdave/exim

New OIG scraper for Eximbank