Gyuricska Milán / cloud

Manager: email notification fix
Storage: timeout + file type fix
VM: ActionInProgressError fix
VM: increased timeout

django.db.models.field.subclassing.SubfieldBase removed: https://docs.djangoproject.com/en/1.11/releases/1.10/#features-removed-in-1-10
New field classes require to call full_clean() method on Models, because the to_python() din't call automatically.
Related docs: https://docs.djangoproject.com/en/1.11/releases/1.8/#subfieldbase

circle, common, dashboard, firewall, request: fix deprecated context and cache handling, get_models, and max_length type for ConnectCommand name

Closes #302

Closes #384

Closes #359

https://docs.djangoproject.com/en/1.7/ref/models/instances/#the-permalink-decorator