Added a canonicalName method to plugins.
Added a canonicalName method to plugins.

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