Changed nick class not to use __slots__.
Changed nick class not to use __slots__.

ProgVal/Limnoria-test,mazaclub/mazabot-core,frumiousbandersnatch/supybot-code,Ban3/Limnoria,haxwithaxe/supybot,jeffmahoney/supybot,raboof/supybot,buildbot/supybot,Ban3/Limnoria,prashantpawar/supybot-rothbot,mazaclub/mazabot-core,ProgVal/Limnoria-test,kblin/supybot-gsoc