Voting UX improvements

Voting has been redesigned. Existing voting widget has been replaced by “Upvoted by” bar displaying number of upvotes along with who upvoted question/answer.

Other changes that have been made:

• App’s name changed to Questions and Answers Community, new name fits better our vision,
• Beta version information has been removed from app header,
• Minor UI improvements related to displaying avatars and comments’ action buttons.