View questions now is View results and redirects to results
in public view.
Fixed flaky spec that was making the tests fail.
Added missing specs for polls feature as well as poll model.
Added check in poll card that allows setting the value of
results_enabled flag.
Access to stats/results now is controlled with abilities.
Polls related to proposals will be accessible to the proposal author
like they were administrators.
Back to polls has dissapeared. A link 'Back to proposal' will be shown
instead.
The button that invites the user to take part in other polls has been
removed.
Stats will flagged as disabled when a poll for a proposal is created.
