Django-owm-legacy

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- `b162867 <https://github.com/openwisp/django-owm-legacy/commit/b162867>`_:
log denied requests with warning level

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- `f66bec1 <https://github.com/openwisp/django-owm-legacy/commit/f66bec1>`_:
update ``last_ip`` on checksum if necessary
- `4ae482e <https://github.com/openwisp/django-owm-legacy/commit/4ae482e>`_:
updated minimum ``django-netjsonconfig`` version to 0.2.3

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- `ebf950a <https://github.com/openwisp/django-owm-legacy/commit/ebf950a>`_:
updated requirements.txt
- `61e6ddd <https://github.com/openwisp/django-owm-legacy/commit/61e6ddd>`_:
fill last_ip and status fields when config is downloaded

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- `1 <https://github.com/openwisp/django-netjsonconfig/issues/1>`_:
upgraded to django-netjsonconfig 0.2

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- ``get_config`` view
- ``get_config_md5`` view
- ``OWM_LEGACY_ALLOWED_SUBNETS`` setting