Netjsonconfig

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- `55 <https://github.com/openwisp/netjsonconfig/issues/55>`_: [vars]
Fixed broken evaluation of multiple variables

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- `b486c4d <https://github.com/openwisp/netjsonconfig/commit/b486c4d>`_:
[openvpn] corrected wrong ``client`` mode, renamed to ``p2p``
- `c7e51c6 <https://github.com/openwisp/netjsonconfig/commit/c7e51c6>`_:
[openvpn] added ``pull`` option for clients
- `dde3128 <https://github.com/openwisp/netjsonconfig/commit/dde3128>`_:
[openvpn] differentiate server between manual, routed and bridged

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- added ``OpenVpn`` backend
- `afbc3a3 <https://github.com/openwisp/netjsonconfig/commit/afbc3a3>`_:
[openwisp] fixed openvpn integration (partially backward incompatible)
- `1234c34 <https://github.com/openwisp/netjsonconfig/commit/1234c34>`_:
[context] improved flexibility of configuration variables
- `54 <https://github.com/openwisp/netjsonconfig/issues/54>`_: [openwrt]
fixed netmask issue on ipv4

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- `53 <https://github.com/openwisp/netjsonconfig/issues/53>`_: [docs]
avoid ambiguity on dashes in context
- `52 <https://github.com/openwisp/netjsonconfig/pull/52>`_: [schema]
added countries list as ``enum`` for radios (thanks to `zachantre
<https://github.com/zachantre>`_)

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- `50 <https://github.com/openwisp/netjsonconfig/issues/50>`_: [openwrt]
add logical name to all generated configuration items

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- `c588e5d <https://github.com/openwisp/netjsonconfig/commit/c588e5d>`_:
[openwrt] avoid adding ``dns`` and ``dns_search`` if ``proto`` is
``none``