修改login_form,增加username password关键字
Revert "修改login_form,增加username password关键字"

This reverts commit 5aae2611d2dc486352c7d33a3520a8336dffc876.
Revert "Revert "修改login_form,增加username password关键字""

This reverts commit 6ea1a4299d44ccb6f114a5d53a90e26e0fd33b72.
删除污染代码
修改后端认证bug
修复is_teacher bug
Merge branch 'develop' into feature/experiment_model_design

Conflicts:
	OEMS/urls.py
	templates/login_form.html