message: update storeService for simpler json
diff: function loadJSON(file) {
  return $http.get(file)
  .then(function(json) {
  - return json.data.itemHash;
  + return json.data;
  });
  }
  function getMissingSourceHashes(itemHash, missingSources) {
  - if (missingSources.$$state.value) {
  - missingSources = missingSources.$$state.value;
  - }
  if (missingSources[itemHash]) {
  - return missingSources[itemHash].sourceHashes;
  + return missingSources[itemHash][0];
  }
  return false;
  }
  