The changes to the configuration required some non minor changes to the platform and also added some flexibility we don't require yet - and thus some new possibilities for errors.

So instead we still use the allow_..._certs and ..._cert_prefix options.
They basically provide the framework in which service levels can operate.

The service level configuration will not include the cert prefix anymore.
It only states if the service level is rate limited or not.
This avoids conflicts between the two configuration options.

I also removed the anonymous service level entirely.
It was also turning a boolean decision (do we provide anonymous eip or not) into something way more complex. Instead I added the AnonymousServiceLevel class to handle the corner cases for people who are not logged in.

Furthermore i renamed the UnauthenticatedUser to AnonymousUser so it matches the Anonymous Service Level nicely. It's also shorter and more intuitive.

Null Pattern for current_user - use it to get rid of some conditionals

this still allows us to do current_user.service_level.

Have not gone through the rest of the code yet.
Only made sure logged_in? now tests for is_a? User instead of !!current_user

:api/service will return a hash of the current users service level

This is failiing if the user is not logged in. Instead it should return the service description for an anonymous user.

cleaned up all the engine stuff that was never really used.
Afterwards there is not that much left that makes it into the toplevel.

* set locale based on request header
* enforce locale path prefix when current locale is not the default
* note: don't use root_path anymore, instead use home_path

we were only using Users#show to redirect to the edit action. So I replaced that with the overview and we have no more use for the extra controller.

This also simplifies linking to the users in question a lot.