Merge pull request killme2008#6 from wangxiaoxiao88/master

there are some incompatile changes between express 3.x and 4.0

package.json

@@ -3,7 +3,7 @@
   "version": "0.0.2",
   "dependencies": {
     "ejs": ">= 0.7.2",
-    "express": ">=3.0",
+    "express": "3.x",
     "zookeeper":">=3.4.1-4",
     "express-namespace":">=0.1.1"
   }