allow data.json URLs via GET parameter on validator
allow data.json URLs via GET parameter on validator

dhootha/project-open-data-dashboard,albertcrowley/project-open-data-dashboard,albertcrowley/project-open-data-dashboard,mchelen/project-open-data-dashboard,dhootha/project-open-data-dashboard,albertcrowley/project-open-data-dashboard,mchelen/project-open-data-dashboard,dhootha/project-open-data-dashboard,mchelen/project-open-data-dashboard