Removed fixtures. Added factory_girl gem. Started fixing tests.
Added field report for metric. It filled after report creation to prevent query to metric.reports.
Fixed metrics_controller tests.
Fixed all default tests. Now all pass. Removed perfomance test.
Added tests for metric.
Added test for metric difference and previous_record method.
Added tests for report model.
Added tests to Tariff model. used_in method renamed to that_was