Remove Python heavy lifting from view files

[aaronrudkin]

In general we don't want Python code doing actual work with the data running in template code. The template code should be passed everything it needs and just do displaying.

• [x] about.tpl
• [x] articles.tpl
• [x] base.tpl
• [x] carousel.tpl
• [x] congress.tpl
• [x] data.tpl
• [x] district.tpl
• [x] error.tpl
• [x] header.tpl
• [x] member_party_list.tpl
• [x] member_votes.tpl
• [x] outdated.tpl
• [x] parties_glance.tpl
• [x] parties.tpl
• [x] past_data.tpl
• [x] person.tpl
• [x] quota.tpl
• [x] search_results.tpl
• [x] search.tpl
• [x] source_images.tpl
• [ ] vote_metadata.tpl
• [x] vote.tpl

[aaronrudkin]

I think this is a pretty good entry point into the code. Ideally we want to be migrating actual actionable code from views -> app.py and from app.py -> model, and since a lot of it is just refactoring, probably it would be a fairly good entry point. I have checked off a bunch of these scripts, but someone else should do another pass and really make sure that nothing non-trivial is being done in templating code.