when sorting a column with booleans false is treated as null
when sorting a column with booleans false is treated as null

ppossanzini/ui-grid,FernCreek/ng-grid,angular-ui/ng-grid-legacy,FugleMonkey/ng-grid,angular-ui/ng-grid-legacy,ppossanzini/ui-grid,angular-ui/ng-grid-legacy,FernCreek/ng-grid,FugleMonkey/ng-grid,ppossanzini/ui-grid,FernCreek/ng-grid,FugleMonkey/ng-grid