Django-analytical

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* Allow port in Piwik domain path. (Alex Ramsay)

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* Fix a bug with the extra Google Analytics variables also pushing the `_gat.`
flag onto the configuration array.

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* Update Woopra JavaScript snippet (Aleck Landgraf)

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* Support Rating\mail.ru (Nikolay Korotkiy)
* Support Yandex.Metrica (Nikolay Korotkiy)
* Add support for extra Google Analytics variables (Steve Schwarz)
* Remove support for Reinvigorate (service shut down)

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* Support Django 1.9, drop support for Django < 1.7 (Hugo Osvaldo Barrera)
* Support custom user models with an alternative username field (Brad Pitcher)

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* Add Piwik user variables support (Alexandre Pocquet)