Store: clear cache and sync items on logout.

src/store/reducers.ts

@@ -110,6 +110,9 @@ export const collections = handleActions(
       }
       return state;
     },
+    [actions.logout.toString()]: (state: CacheCollectionsData, _action: any) => {
+      return state.clear();
+    },
   },
   ImmutableMap({})
 );
@@ -162,6 +165,9 @@ export const items = handleActions(
       }
       return state;
     },
+    [actions.logout.toString()]: (state: CacheItemsData, _action: any) => {
+      return state.clear();
+    },
   },
   ImmutableMap({})
 );