Hubot

Send messages that are formated as below to hubot and show responses in the conversation.

```
> !hubot ping
PONG # Reply just to you, in that conversation

> #!hubot ping
PONG # Reply to all gifman users registered in that conversation
```

The latter option is yet to be implemented. Requires a bit more work to cope with presence of users in different rooms, both within hubot and at the gifman level.