Store timeout ID so we can clear in shutdown
Store timeout ID so we can clear in shutdown

Fixes #523

msound/hubot,hcxiong/hubot,scboucher/hubot,pchaigno/hubot,ClaudeBot/hubot,ykelvis/hubot,keyvanakbary/hubot,wieden-kennedy/hubot,bgranberry/hubot,alexchenfeng/hubot,julianromera/hubot,michaelansel/hubot,mrb/hubot,github/hubot,Mattlk13/Hubot,Arthraim/merlin,rileytg/chenbot,fgbreel/hubot,bradparks/hubot__github_chat_bot,rlugojr/hubot,hubotio/hubot,limianwang/hubot,github/hubot,Drooids/hubot,nandub/hubot,vkhang55/hubot,kristenmills/hubot,kgrz/hubot,alexchenfeng/hubot,andrewpong/awp-hubot,mauricionr/hubot,RiddickSky/hubot,SIOPCO/hubot,rmdelo/appboy-hubot,decaffeinate-examples/hubot,alucardzhou/hubot,daudich/hubot,voltsdigital/hubot,awbauer/hubot,howprice/hubot,nakaearth/myhubot,PopExpert/hubot,ykusumi/test-hubot,Hartmarken/hubot,cameronmcefee/hubot,craig5/hubot,chadfurman/hubot,b3nj4m/hubot,minted/hubot,jasonrhodes/botzero,mutewinter/hubot,nandub/hubot,skcript/skubot,jasonkarns/hubot,kkirsche/hubot,markstory/hubot,shinvdu/hubot,edorsey/hubot,ajschex/hubot,eetuuuu/hubot,RavenB/hubot,codydaig/hubot,decaffeinate-examples/hubot,lisb/hubot,fstehle/hubot,tiagochiavericosta/hubot,ToriTomyuTomyu/nothing-yet,ouadie-lahdioui/hubot,mchill/hubot,brodul/hubot,blackwellops/hubot,PopExpert/hubot,scboucher/hubot,jianchen2580/hubot,hotrannam/hubot,ToriTomyuTomyu/nothing-yet,lisb/hubot,mjurczyk/hubot,andrewpong/awp-hubot,gregkare/hubot,alex-zhang/hubot,AlexandrPuryshev/hubot,wyncode/hubot,davidkassa/hubot,PropertyUX/nubot,CobyR/hubot,GrimDerp/hubot,rayatbuzzfeed/hubot,geoffreyanderson/hubot,alexchenfeng/hubot,leohmoraes/hubot,plated/hubot,mujiansu/hubot,aslihandincer/hubot,ddmng/brazil82-hubot,danielcompton/hubot,hubotio/hubot,armilam/lessonly-bort,rileytg/chenbot,joshsobota/hubot,zvelo/hubot,makii42/hubot,jschell/hubot,yujiroarai/hws-hubot,WaleedAshraf/hubot,rafaell-lycan/Hubot-X9,ajayanandgit/hubot,ooohiroyukiooo/hubot,lisb/hubot,melexis/melexis-hubot,krahman/hubot,dopeboy/hubot,PropertyUX/nubot,Snorlock/hubot,markstory/hubot,alexchenfeng/hubot,sharabash/hubot,lukw00/hubot,doudoupower/hubot,sdimkov/hubot,mcanthony/hubot,cycomachead/hubot,alexchenfeng/hubot,iDTLabssl/hubot,poppingtonic/hubot,eshamow/gutterbot,taojuntjpp/hubot