Openwisp-controller

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- [feature] Added geographic and indoor mapping module
- [feature] Aded Dockerfile

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- `21 <https://github.com/openwisp/openwisp-controller/issues/21>`_:
[admin] Added a link to password reset in login form

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- Added support for django-x509 0.3.0

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- `934be13 <https://github.com/openwisp/openwisp-controller/commit/934be13>`_:
[models] Updated sortedm2m __str__ definition
- `b76e4e2 <https://github.com/openwisp/openwisp-controller/commit/b76e4e2>`_:
[requirements] django-netjsonconfig>=0.6.3,<0.7.0

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- `f3dc784 <https://github.com/openwisp/openwisp-controller/commit/f3dc784>`_:
[admin] Moved ``submit_line.html`` to `openwisp-utils
<https://github.com/openwisp/openwisp-utils>`_

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- `0064b98 <https://github.com/openwisp/openwisp-controller/commit/0064b98>`_:
[device] Added ``system`` field
- `c7fe513 <https://github.com/openwisp/openwisp-controller/commit/c7fe513>`_:
[docs] Added "Installing for development" section to README
- `c75fa68 <https://github.com/openwisp/openwisp-controller/commit/c75fa68>`_:
[openwisp-utils] Moved shared logic to `openwisp-utils
<https://github.com/openwisp/openwisp-utils>`_
- `819cb21 <https://github.com/openwisp/openwisp-controller/commit/819cb21>`_:
[requirements] django-netjsonconfig>=0.6.2,<0.7.0