update pref table in parse.

PlayStore.coffee

# UPDATE Pref table to include current user in peggedBy array
    console.log "peggee: #{peggeeId}  card: #{cardId}  choice: #{choiceId} "
    card = new Parse.Object 'Card'
    card.set 'id', cardId
    peggee = new Parse.Object 'User'
    peggee.set 'id', peggeeId
    prefQuery = new Parse.Query 'Pref'
    prefQuery.equalTo 'card', card
    prefQuery.equalTo 'user', peggee
    prefQuery.first
      success: (pref) =>
        pref.addUnique 'peggedBy', UserStore.getUser().id
        #pref.set 'peggedBy', null
        pref.save()