refactor(speakers): remove undefined class
refactor(speakers): remove undefined class

closes #24

nReality/AgileAfricaConf-app,sinholic/aero-flyer,nReality/SUGSA-ScrumGathering-App2016,aayushkapoor206/whatshot,subsolo/ITHC,Shinobi881/startionic2,laodice/ionic-conference-app-session2,Shinobi881/startionic2,Shinobi881/startionic2,abdolmajidazad/neveshtak,sinholic/aero-flyer,tommy-boy/AMZNDEALS,aayushkapoor206/whatshot,aayushkapoor206/whatshot,nReality/SUGSA-ScrumGathering-App2016,tommy-boy/AMZNDEALS,AlexFine/ionic-conference-app,tommy-boy/AMZNDEALS,laodice/ionic-conference-app-session2,pierrecabriere/Greencharge,pierrecabriere/Greencharge,AlexFine/ionic-conference-app,driftyco/ionic-conference-app,nReality/AgileAfricaConf-app,Splaktar/ionic-conference-app,nReality/AgileAfricaConf-app,fmsouza/mangiare,manikumarsst/myconf,nReality/AgileAfricaConf-app,TobiasSchaeuble/HMAD,nReality/SUGSA-ScrumGathering-App2016,ziggyJ/ionic-conference-app,nReality/SUGSA-ScrumGathering-App2016,kumarnavinrai/finalmcu,fmsouza/mangiare,aayushkapoor206/whatshot,nReality/SUGSA-ScrumGathering-App2016,AlexFine/ionic-conference-app,kumarnavinrai/finalmcu,AlexFine/ionic-conference-app,ericel/weytindey,francarmona/ionice-contryside-events-app,nReality/SUGSA-ScrumGathering-App2016,Splaktar/ionic-conference-app,subsolo/ITHC,ericel/weytindey,abdolmajidazad/neveshtak,nReality/SUGSA-ScrumGathering-App2016,Beslinda/catalogIonicApp,TobiasSchaeuble/HMAD,pierrecabriere/Greencharge,francarmona/ionice-contryside-events-app,nReality/AgileAfricaConf-app,minhlong/NamHoa-Ionic,francarmona/ionice-contryside-events-app,driftyco/ionic-conference-app,minhlong/NamHoa-Ionic,manikumarsst/myconf,subsolo/ITHC,Beslinda/catalogIonicApp,sinholic/aero-flyer,TobiasSchaeuble/HMAD,kumarnavinrai/finalmcu,minhlong/NamHoa-Ionic,driftyco/ionic-conference-app,laodice/ionic-conference-app-session2,abdolmajidazad/neveshtak,ziggyJ/ionic-conference-app,fmsouza/mangiare,ericel/weytindey,fmsouza/mangiare,nReality/AgileAfricaConf-app,Beslinda/catalogIonicApp,aayushkapoor206/whatshot,nReality/AgileAfricaConf-app