Add flag for using pre-production data
Scroll referendum descriptions.

In contest detail view, dynamically switch between scrolling canditates list and scroll view
for title/subtitle based on whether contest is a referendum are not.

Doing this because only one thing that scrolls can be in a view, but referendums have no candidates.
Merge pull request #79 from flibbertigibbet/feature/scroll-referendums

Scroll referendum descriptions.
Merge pull request #77 from flibbertigibbet/feature/add-preproduction-flag

Add flag for using pre-production data