code: function getCollectionScores (app) {
      const categoryQuery = store.getCollectionQuery(app);
      const globalQuery = R.dissoc('category', categoryQuery);
  
      return Promise.all([
        store.list(globalQuery),
        store.list(categoryQuery)
      ])
      .then(R.map((list) => findRank(list, app)))
      .then((ranks) => ({
        global: {
          rank: ranks[0],
          score: rankScore(100, store.MAX_LIST, ranks[0])
        },
        category: {
          rank: ranks[1],
          score: rankScore(10, store.MAX_LIST, ranks[1])
        }
      }));
    }
docs: /*
  Get the rankings of the app in the top list and top category list and score
  them.