census flat file parsing: CBSACode and MedianAge special cases #125

Job	Run time
hmda_analytics_tests	2m 38s
check_digit_tests	2m 21s
data_browser_tests	2m 46s
common_tests	2m 31s
hmda_data_publisher_tests	3m 31s
hmda_platform_tests	5m 37s
hmda_quarterly_data_service_tests	2m 18s
hmda_reporting_tests	2m 36s
institutions_api_tests	2m 27s
ratespread_calculator_tests	2m 19s
modified_lar_tests	2m 20s
rate_limit_tests	2m 11s
submission_errors_tests	2m 20s
	35m 55s

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