def up_vote!(voteable)
      begin
        up_vote(voteable)
        success = true
      rescue Exceptions::AlreadyVotedError
        success = false
      end
      success
    end
def up_vote!(voteable)
      begin
        up_vote(voteable)
        success = true
      rescue Exceptions::AlreadyVotedError
        success = false
      end
      success
    end
Up votes the +voteable+, but doesn't raise an error if the votelable was already up voted.
 The vote is simply ignored then.