Web-app: Linked post notes to the group selector that already exists
Web-app: Dropbox upload file
Web-app: Remove uploaded file on server
Web-app: Get link of file and save to db
Web-app: Show notes to Student
Web-app: fixed errors
Web-app: Get file name rather than full url in the list of notes
Web-app: fixed bug
Merge remote-tracking branch 'origin/master'