Select on FindElection updates and switches to new election

FIXME: The child references to the election are not updated, so the app
crashes when a segue to the ContestDetails view is attempted.
More Elections list tap --> Ballot View
Bugfix BallotView doesn't update on election change
Save/Restore PollingLocation view state
Merge branch 'feature/other-elections' into develop
Merge branch 'develop' of github.com:votinginfoproject/ios7-white-label-app into develop