Modify questionDetailView

After select one question from questionList, navigate user to the
questionDetailView (as featured in paperMockups ⑧) where
- At the header, there is a movieController playing the questionVideo
- Below the movieController, there is a takeAnswer button
- Each answer of this question will be display at the tableView
- Only answer with visibility==open will be displayed at this time.
Will modified for friends or follow.

Will add a answerVideo view as featured in paperMockups ⑨