add cluster-store

package.json

@@ -43,6 +43,7 @@
     "bookshelf": "^0.7.9",
     "btoa": "1.x",
     "bytes": "^1.0.0",
+    "cluster-store": "^1.0.0",
     "compression": "1.x",
     "connect": "3.x",
     "connect-cors": "0.5.x",
@@ -67,7 +68,7 @@
     "etag": "^1.5.1",
     "express": "4.x",
     "express-lazy": "1.x",
-    "express-session": "1.x",
+    "express-session": "^1.11.3",
     "finalhandler": "^0.3.4",
     "foreachasync": "5.x",
     "fresh": "^0.2.4",