RFE: add options to implement /ignore

[dhutty]

Perhaps to the logger configuration so that the logs can't contain almost useless join/parts/nicks/quits messages.

And/or to the log presentation web UI (perhaps via CSS classes) such that the log viewer can choose to enable/disable presentation of such messages.

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[prologic]

So something like:

[logging]
events = ['privmsg']

[prologic]

Re "log viewer"; I guess kdb doesn't really have one yet :) See #31