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Bug fixes:
- Fixes 187: Invalid dependency on plone.app.caching
[jensens] (187)
- Cleanup: Remove meanwhile unused test fixture code refering to ``plone.app.caching``.
Removed class and fixtures: ``ThemingWithCaching``, ``THEMINGWITHCACHING_FIXTURE``, ``THEMINGWITHCACHING_TESTING``.
Those were nowhere used active in Plone nor outside in Github.
[jensens] (188)