Fix type in switch statement
Changed error reporting to look at body.errmsg
Finish final step of push voice to user after retrieving media_id from wechat
Create test voice message key with mp3 file extension
Generate time-stamped mp3 files for teacher voice messages to send to Qiniu
Fixed error handling for voice messages
Fixed mediaId variable declaration for pushVoiceMsg
Parse JSON of body response to media transfer to wechat
Reset time counter on teacher client after voice message sends successfully to Qiniu