Openwisp-controller

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- [requirements] Updated requirements and added support for django 2.0

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- [pki] Reimplemented serial numbers as UUID integers
- [pki] Added switcher that facilitates importing certificates
- [pki] [admin] Removed ``serial_number`` from certificate list

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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