Added a link to download historical stubs

I believe the historical stubs will be available for both spouses,
therefore it shows up on both tabs. If that is incorrect (and they can
only download their own), this link will need to be moved into the
primary tab.
2012 isn't quite accurate - the archive will include everything up to mid 2014. I think I see why you're saying 2012 here (the dropdown goes back to 2012, at least for now). But I still feel a little uneasy about it.