refs #57 more tweaks to insights and movers and shakers and more tests

plugins/Insights/API.php

plugins/Insights/Controller.php

plugins/Insights/DataTable/Filter/MinGrowth.php

plugins/Insights/InsightReport.php

plugins/Insights/Visualizations/Insight.php

plugins/Insights/Visualizations/Insight/Config.php

plugins/Insights/javascripts/insightsDataTable.js

plugins/Insights/lang/en.json

plugins/Insights/stylesheets/insightVisualization.less

plugins/Insights/templates/cannotDisplayReport.twig

plugins/Insights/templates/insightControls.twig

plugins/Insights/templates/insightVisualization.twig

plugins/Insights/templates/insightsOverviewWidget.twig

...ns/Insights/templates/moversAndShakersOverviewWidget.twig

plugins/Insights/templates/overviewWidget.twig

plugins/Insights/templates/table_row.twig

plugins/Insights/tests/ApiTest.php

plugins/Insights/tests/FilterMinGrowthTest.php

plugins/Insights/tests/InsightReportTest.php