Add slackUsernameFormat config option

[laughinghan]

Close #56

[coveralls]

Coverage increased (+0.003%) to 99.457% when pulling 4fb44ed4a4846819d41f281791fca82ae5485502 on laughinghan:slackUsernameFormat into d35d7b9c0bb68b90ffe77ec33104300b0f88f111 on ekmartin:master.

[coveralls]

Coverage increased (+0.003%) to 99.457% when pulling 4fb44ed4a4846819d41f281791fca82ae5485502 on laughinghan:slackUsernameFormat into d35d7b9c0bb68b90ffe77ec33104300b0f88f111 on ekmartin:master.

[laughinghan]

@ekmartin: lol did you add Coveralls twice or something

[ekmartin]

Brilliant! I agree with what you said in https://github.com/ekmartin/slack-irc/issues/56#issuecomment-258967286 - let's go with $username (IRC) as the default. Whether it's a breaking change or not is up for discussion, but I think it's fine to just do it in a minor version bump, since as you said - it's a cosmetic change.

Should this maybe be nested under an object, to make it cleaner to add support for IRC username formatting as well?

"usernameFormat": {
   "slack": "$username (IRC)",
   "irc": "<$username>"
}

Or do you think it's clearer with just slackUsernameFormat and ircUsernameFormat?

EDIT: No idea what's happening with coveralls, let's see if it's a one-time incident ¯\_(ツ)_/¯

[laughinghan]

Great! Will do.

I don't think it should be nested, but I also see no use for ircUsernameFormat since messages in IRC from the bot (piped from Slack) are already distinguished by coming from the bot, much moreso than bot messages in Slack.

[ekmartin]

I think one use case would be if people for some reason would want to remove the username when messages are posted to IRC. Might be good to have both just for unity, but we can merge this and look at it later.

[laughinghan]

@ekmartin: eh yeah let's just deal with that later. Updated default Slack username format.

[coveralls]

Coverage increased (+0.003%) to 99.457% when pulling 233480070983d9d09083e79c86392d9ff1c972da on laughinghan:slackUsernameFormat into d35d7b9c0bb68b90ffe77ec33104300b0f88f111 on ekmartin:master.

[ekmartin]

Great, thanks! I'll create a release later.

[ekmartin]

Released in 3.9.0 - thanks again!