Upgrade to Rails 5.x

paz requested to merge rails-5.x into master

I tried to migrate the configuration so that the behaviour of the application doesn't change through the upgrades to 5.x.

The encrypted secrets feature is not used by schleuder-web, neither is the built-in support for custom configuration.

Sorry that the list of changes is so big. I figured that a repeated MR for each update-step would be too much, either.

Edited by paz

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