Squashed 'bundle/whiteboard/' changes from 4d27f4b..d76ead1

d76ead1 updated mini file
55f5312 handle login of teacher and studen for same browser

git-subtree-dir: bundle/whiteboard
git-subtree-split: d76ead197070fc1fd185f68c66e467893980117d
Merge commit '9fd3590e023158eabbf2f50752d0e2033b512e7f'