rpc 通信和判题初步测试通过；判题服务器不再依赖 redis 和 mysql。

oj/__init__.py

@@ -6,4 +6,9 @@
 \___/  |_| |_||_||_||_| |_| \___|  \___/  \__,_| \__,_| \__, | \___| |_.__/  \__, |  \__, | \__,_| \__,_|
                                                         |___/                |___/      |_|
 https://github.com/QingdaoU/OnlineJudge
-"""
+"""
+from __future__ import absolute_import
+
+# This will make sure the app is always imported when
+# Django starts so that shared_task will use this app.
+from .celery import app as celery_app