Update simple_form to rc
Update poltergeist
Add a VoteCreator which (will) handle the callbacks on Vote

This will make importing easier, and extract some callback logic into easier
to read places
Rework VoteCreator. #create now creates and returns the vote.

Updated tests and controller to use this.
Merge branch 'vote-creator'

Update tests to pass
Fix VoteCreator specs
Merge branch 'master' into accepted-answer
Add support for importing accepted answer data