去掉sha256包，加入默认属性

core/model/user.coffee

@@ -4,6 +4,11 @@ class User extends BaseModel
 	constructor : (@data = {name : null}) ->
 		super()
 		@data.passwd_salt = crypto.createHash('sha256').digest('hex')
+		@data.signup_at = Date.parse new Date
+		@data.group = []
+		@data.tokens = []
+		@data.setting = {}
+		@data.attribute = {}
 	@table : ->
 		'users'
 module.exports = User

package.json

@@ -22,7 +22,6 @@
     "jade": "*",
     "i18next": "*",
     "coffee-script": "*",
-    "node-sha256": "*",
     "mongous" : "*"
   }
 }