Use ajax for voting.

FIXME: pagination.
Add vote-for-{{id}} to upvote button, for testing.
Bugfix votes_count work.
Use partial for upvote again.
Add answers back in to responses.
Merge branch 'master' into ajax-voting-v2
Get cucumber working with javascript
Pop login if receive a 401 back.
Doc that we don't handle other error statuses.
Use Accept header instead of funky .json suffix.
Showing login modal dialog.
Merge pull request #66 from askaway/ajax-voting-v2

Use ajax for voting.