[Corona] Add possibility to get return code identifiers

Review Request #161 — Created Sept. 30, 2013 and submitted — Latest diff uploaded

pprkut
Lunr
pprkut:locator
lunr
Up to now there was no possibility to get a list of all identifiers for return codes in the response object.
That in turn made it impossible to retrieve all error messages from the response object, unless you already knew exactly which errors to expect.

The use case for this is pretty small, but for the sake of completeness offer this functionality as well.
Unit tests
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