Add a reply function

[wraithan]

Something like

def reply(to, message, highlight=False):
    if highlight:
        zen.privmsg(to['channel'], to['nick'] + ': ' + message)
    else:
        zen.privmsg(to['channel'], message)

The idea is to make it so the services don't really need to care about the protocol as much, then if we upgrade the protocol to version 2, it wont cause any issues. For example, if server was added, it could easily pass that along.