Use django.contrib.auth instead of manually user control.

Signed-off-by: cyberzhg <cyberzhg@gmail.com>
Merge branch 'dev' of https://github.com/CyberZHG/Catnip into dev

Conflicts:
	dev/account/forms.py
	dev/account/settings.py
	dev/account/views.py
	dev/log/utils.py
	dev/processer/settings.py
	dev/processer/urls.py
	dev/system/urls.py
	dev/system/views.py

Signed-off-by: cyberzhg <cyberzhg@gmail.com>