Puput

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Updated to Wagtail 2.0/Django 1.11 compatibility
Removed compressor configuration

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* Add missing image.
* Add missing `str` methods.

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* Fix header image.

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* Add support for Django 2.0 and Wagtail 2.0. Drop Python 2.7 support.
* Add code and block quote options to the entries text editor.
* Improve default template visualisation.
* Configurable default template color.
* Add social sharing links.

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* Remove django-compressor dependency.
* Add German and Polish translations.

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* Add missing migration.