When the collection is updated, the collectionWordCloudVersion is res…

…et to 0.

This should allow card-view to reset to null when the collection changes so it doesn't show an ou tof date cloud.

Part of #694.

src/reducers/collection.ts

@@ -70,6 +70,7 @@ const app = (state : CollectionState = INITIAL_STATE, action : SomeAction) : Col
 			activeViewMode: action.viewMode,
 			activeViewModeExtra: action.viewModeExtra,
 			activeRenderOffset: 0,
+			collectionWordCloudVersion: 0
 		};
 	case UPDATE_COLLECTION_SHAPSHOT:
 		//TODO: figure out how to fire this every time one of the other ones