Added hostmask command.
Added hostmask command.

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