Update gitignore for platforms/plugins
Update gitignore for platforms/plugins

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