Monitor uptime of corobo

[meetmangukiya]

First steps:

1. Maintain two vars no_of_messages_received and no_of_messages_sent.
2. Assert that no_of_messages_sent > no_of_messages_received

This gives a vague indication whether the bot is working clearly or not.

Next steps:

1. Log messages received and reply sent for those messages in a db for better debugging