Out of range query params should trigger a 4XX response

[tobie]

Currently, the count query param is capped at 1000. This is opaque to the user of the API which gets the same data set whether the count query param is set to 1000 or 100000000.

Instead of silently capping the value, I suggest returning a 4XX response with an appropriate error message when the count query param is bigger than 1000.