def get_crisis(identifier, params = nil)
            return nil if identifier.nil? or identifier.empty?
            endpoint = "/v1/crises/#{identifier}.json?auth_token=#{@auth_token}"
            endpoint += "&#{URI.encode_www_form params}" if params
            response = self.get(endpoint)
            Sigimera::Crisis.new JSON.parse response.body if response and response.body
        end
def get_crisis(identifier, params = nil)
            return nil if identifier.nil? or identifier.empty?
            endpoint = "/v1/crises/#{identifier}.json?auth_token=#{@auth_token}"
            endpoint += "&#{URI.encode_www_form params}" if params
            response = self.get(endpoint)
            Sigimera::Crisis.new JSON.parse response.body if response and response.body
        end
This method returns a single crisis.

 @param [String] identifier A unique crisis identifier
 @return [Hash] The single crisis as JSON object