Potential memory leak

[cthill]

From dmesg:

[4715726.348144] Out of memory: Kill process 29391 (python) score 864 or sacrifice child
[4715726.349553] Killed process 29391 (python) total-vm:4051468kB, anon-rss:1795696kB, file-rss:0kB, shmem-rss:0kB
[4715726.450468] oom_reaper: reaped process 29391 (python), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB

From server logs:

14-08-18 20:46:21 account_svr  INFO     save request 46.239.122.210:53668 HaZZe:---
14-08-18 20:46:22 account_svr  INFO     client 46.239.122.210:53668 disconnected
./cradle.sh: line 11: 29391 Killed                  python src/main.py
Cradle: non-zero exit code...
Cradle: restarting server...
14-08-18 20:48:20 root         INFO     LocalSO v1.3

[cthill]

Fixed 88fcfae