Netjsonconfig

--------------------------

- `69 <https://github.com/openwisp/netjsonconfig/pull/69>`_: [docs]
Improved contributing guidelines (thanks to `EdoPut
<https://github.com/EdoPut>`_)
- `71 <https://github.com/openwisp/netjsonconfig/pull/71>`_: [bin] Added
``validate`` to available methods of command line tool (thanks to
`EdoPut <https://github.com/EdoPut>`_)
- `845ed83 <https://github.com/openwisp/netjsonconfig/commit/845ed83>`_:
[version] Improved get_version to follow PEP440
- `73 <https://github.com/openwisp/netjsonconfig/pull/73>`_: [netjson]
Fixed compatibility with `NetJSON <http://netjson.org>`_ specification

--------------------------------

- `d481781 <https://github.com/openwisp/netjsonconfig/commit/d481781>`_:
[docs] Added OpenWRT PPPoE example
- `beb435b <https://github.com/openwisp/netjsonconfig/commit/beb435b>`_:
[docs] Fixed Basic Concepts summary

--------------------------

- `65 <https://github.com/openwisp/netjsonconfig/pull/65>`_: [openwrt]
Added missing zonename attribute

--------------------------------

- `4aaecae <https://github.com/openwisp/netjsonconfig/commit/4aaecae>`_:
[docs] Added documentation regarding template overrides

--------------------------

- `6f712d1 <https://github.com/openwisp/netjsonconfig/commit/6f712d1>`_:
[utils] Implemented identifiers as parameters in ``utils.merge_list``
- `fcae96c <https://github.com/openwisp/netjsonconfig/commit/fcae96c>`_:
[openwrt] Added ``config_value`` identifier in ``utils.merge_list``
- `eaa04de <https://github.com/openwisp/netjsonconfig/commit/eaa04de>`_:
[docs] Improved `"All the other settings"
<http://netjsonconfig.openwisp.org/en/stable/backends/openwrt.html#all-the-other-settings>`_
section in ``OpenWrt`` backend
- `60 <https://github.com/openwisp/netjsonconfig/issues/60>`_ [openvpn]
Fixed ``resolv_retry`` bug; **minor backward incompatible change**:
handled in `django-netjsonconfig with a migration
<https://github.com/openwisp/django-netjsonconfig/commit/f16768d3e9031197a71cd988c0643f88a4badbd7>`_
- `f25e77e <https://github.com/openwisp/netjsonconfig/commit/f25e77e>`_:
[openvpn] Added ``topology`` attribute to schema
- `c4aa07a <https://github.com/openwisp/netjsonconfig/commit/c4aa07a>`_:
[openvpn] Allow to omit seconds in status attribute

--------------------------

- `56 <https://github.com/openwisp/netjsonconfig/issues/56>`_: [general]
Implemented smarter merge mechanism
- `57 <https://github.com/openwisp/netjsonconfig/issues/57>`_: [openwrt]
Fixed interface ``enabled`` bug
- `7a152a3 <https://github.com/openwisp/netjsonconfig/commit/7a152a3>`_:
[openwrt] Renamed ``enabled`` to ``disabled`` in OpenVPN section (for
consistency)