Kotori

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- Work on Ubuntu 16.04 compatibility: Nail some more Python dependency modules

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- Add Python dependency ``python-dateutil``

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- Tap into data transmission from Homie_-based sensor nodes for ESP8266 (e.g. `node-wifi-mqtt-homie.ino`_).
See also :ref:`json-homie`. Thanks, Alex!

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- Prepare CSV import of http://archive.luftdaten.info/. Thanks, Richard!

- Allow semicolon (``;``) as separator for CSV import
- Allow CSV field ``timestamp`` as alias for datetime

- Publish Grafana v4.2.0-beta1 debian packages to package repository,
see :ref:`foundation-packages` and :ref:`setup-debian`.

- Fix SSL runtime dependency woes ``AttributeError: 'module' object has no attribute 'OP_NO_TLSv1_1'``
with Twisted-17.1.0 vs. python-openssl vs. pyOpenSSL. Thanks, Matthias!

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- Don’t always send http responses as text/plain
- Catch MongoDB database errors, log and respond appropriately

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- Upgrade some Python modules