Use ident instead of nick

[L3viathan]

This is security relevant, as not everyone uses nick protection.

[fenhl]

Using the ident is hardly more secure than using the nick, as I'm the only one in our channel who is actually using identd (see https://en.wikipedia.org/wiki/Ident_protocol#Uses for details). The best solution would be to implement NickServ support, but since Python-IRC-Bot-Framework doesn't support services, using ident and requiring bot-ops to run an identd would be a possible alternative.