Merge branch 'release/1.3.3' into develop

Author: swayf

package.json

@@ -16,8 +16,8 @@
     "url": "git://github.com/swayf/mongoose-path-tree.git"
   },
   "main": "index.js",
-  "version": "1.3.2",
-  "engine": "node >= 0.4.0",
+  "version": "1.3.3",
+  "engine": "node >= 0.8.0",
   "dependencies": {
     "mongoose": "3.x.x",
     "stream-worker": "0.x.x"