Add firebase authentication
Add utf-8 encoding for token request
Don't send errorful voice msgs
Updated weixin-api
Change teacher name to demo teacher for test
Delete myUser variable from index.html
Clear message input in callback
Comment out front-end auth
Comment out bootbox script tag
Comment out firebase simple login js
Comment out bootstrap js
delete html tag from css
Try preventDefault on keyup event
Add action="javascript:void(0);" to text msg form
Add back html overflow scroll default