Squashed 'bundle/virtualclass/' changes from fd5676f..e50ae09

e50ae09 updated teacher file
b70785d done some changes
63159a8 updated auth.php file
4009767 fixed some bugs

git-subtree-dir: bundle/virtualclass
git-subtree-split: e50ae098c8bb8180a49ff02556b5939ddbdce40c
Merge commit '288cd4e7ead1b88ccb81a84adf5deb8f1dad8002'

updated virtualclass bundle
added css file by php