Django-clickclack

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* fixed active manager

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* fixed active manager and current_schedule property

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* add icon for is_active state

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* bigfixing
* updated localization files

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* refactor clickclack
* remove extensions
* cleanup models
* remove management command
* make it more easier and simple
* remove django 1.8 support

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* fix "status" in admin
* remove properties "must_be_turned_off" and "must_be_turned_on"