Use Grape > 0.2.3 formatter

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With the next release of Grape, 0.23 (probably going to be 0.3) you no longer should need to monkey-patch the formatter. You should be able to do this:

module RablFormatter
   def self.call(object)
      ...
    end
end

And in the API:

formatter :json, RablFormatter

[dblock]

See #6