Log more information if we get a bad JSON response.
That part wasn't really supposed to be part of the change.
Start updating style for vote page.

* Update style.css to use Sass. Pull out a tiny bit of common stuff.
* Include bootstrap css in head.html template.
* Update button classes on vote page to use bootstrap.
Include missing file + minor updates.

* common_partial should be its own full stylesheet, so we can put
  actually common CSS classes in there.
* Add title image to new maker page.
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