message: compare button now resets the comparisons array
  this fixes
diff: @@ -54,7 +54,7 @@ function CompareCtrl($scope, toaster, dimCompareService, dimStoreService, $trans
  };
  vm.compareSimilar = function(type) {
  - vm.comparisons = _.union(vm.comparisons, type === 'archetype' ? vm.archeTypes : vm.similarTypes);
  + vm.comparisons = type === 'archetype' ? vm.archeTypes : vm.similarTypes;
  };
  vm.sort = function(statHash) {
  