update demo-facebook commwent to env variables
update demo-facebook commwent to env variables

set BOTFRAMEWORK_APPID and BOTFRAMEWORK_APPSECRET
mmatkow/BotBuilder,dr-em/BotBuilder,yakumo/BotBuilder,xiangyan99/BotBuilder,dr-em/BotBuilder,yakumo/BotBuilder,mmatkow/BotBuilder,stevengum97/BotBuilder,xiangyan99/BotBuilder,stevengum97/BotBuilder,Clairety/ConnectMe,mmatkow/BotBuilder,msft-shahins/BotBuilder,mmatkow/BotBuilder,dr-em/BotBuilder,yakumo/BotBuilder,Clairety/ConnectMe,dr-em/BotBuilder,yakumo/BotBuilder,msft-shahins/BotBuilder,msft-shahins/BotBuilder,Clairety/ConnectMe,stevengum97/BotBuilder,xiangyan99/BotBuilder,msft-shahins/BotBuilder,Clairety/ConnectMe,xiangyan99/BotBuilder,stevengum97/BotBuilder