Django-netjsonconfig

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- `c39fe97 <https://github.com/openwisp/django-netjsonconfig/commit/c39fe97>`_: [requirements]
`netjsonconfig <http://netjsonconfig.openwisp.org>`_ minimum version is now ``0.5.3``
- `0b64032 <https://github.com/openwisp/django-netjsonconfig/commit/0b64032>`_:
[migrations] Renamed ``enabled`` attribute to ``disabled`` in openvpn configurations
- `e0f284a <https://github.com/openwisp/django-netjsonconfig/commit/e0f284a>`_: [admin] Show config UUID hex instead of str
- `6d75336 <https://github.com/openwisp/django-netjsonconfig/commit/6d75336>`_: [controller] Return uuid hex instead of str in ``register()``
- `7f98358 <https://github.com/openwisp/django-netjsonconfig/commit/7f98358>`_: [admin] Added optional ``admin_theme``

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- [general] Improved abstraction and reusability
(**potentially backward incompatible**: many internal functions and classes were changed)
- [docs] Documented how to extend the base models, admin classes, controller views and app config

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- `22 <https://github.com/openwisp/django-netjsonconfig/issues/22>`_: Fixed evaluation of multiple vars

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- [vpn] Use "not equal" operator instead of "is not" in CA validation
- [openvpn] Corrected wrong "client" mode value to "p2p"
- [vpn] Updated custom OpenVpn schema (netjsonconfig 0.5.1)
- [general] require at least netjsonconfig 0.5.1

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- [general] upgraded minimum django version to 1.10
- [general] upgraded minimum netjsonconfig version to 0.5.0
- [general] added VPN Server management (depends on django-x509)
- [general] added ``auto_cert`` feature for automatic management of VPN client certificates
- [template] added ``type`` attribute to ``Template`` model, which can be ``generic`` or ``vpn``
- [config] added required unique ``mac_address`` field to ``Config`` model
- [settings] added ``NETJSONCONFIG_VPN_BACKENDS`` setting
- [settings] added ``NETJSONCONFIG_DEFAULT_VPN_BACKEND`` setting
- [settings] added ``NETJSONCONFIG_DEFAULT_AUTO_CERT`` setting
- [settings] added ``NETJSONCONFIG_CERT_PATH`` setting
- [settings] added ``NETJSONCONFIG_COMMON_NAME_FORMAT`` setting
- [settings] backends are now completely overridable
- [admin] configuration editor is now initialized empty
- [admin] configuration editor buttons order swapped: advanced mode is now on the right side
while "object properties" has been renamed to "configuration menu" and moved to the left side
- [admin] log failed previews for debugging purposes

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- `24 <https://github.com/openwisp/django-netjsonconfig/issues/24>`_: updated outdated dependencies
- `9cd6348 <https://github.com/openwisp/django-netjsonconfig/commit/9cd6348>`_: added a more human readable app verbose name
- `93ddb9f <https://github.com/openwisp/django-netjsonconfig/commit/93ddb9f>`_: removed incorrect ``verbose_name_plural`` from ``AppConfig``
- `4fd23a1 <https://github.com/openwisp/django-netjsonconfig/commit/4fd23a1>`_: updated requirements to be less strict