Improvements to voting flow

# Changes
 - Always redirect to candidate page after submitting a vote.
 - Show flash message in place of tagline, rather than at top of page.

# Screenshot
![screen shot 2014-11-20 at 12 25 20 pm](https://cloud.githubusercontent.com/assets/583202/5129450/6df5d308-70b0-11e4-8e1d-95d14587e734.png)