Bugfix: classes ag-row-group-expanded and ag-row-group-contracted were not getting applied as group expanded and contracted.
Bugfix: classes ag-row-group-expanded and ag-row-group-contracted were not getting applied as group expanded and contracted.

ceolter/ag-grid,seanlandsman/ag-grid,killyosaur/ag-grid,killyosaur/ag-grid,makinggoodsoftware/ag-grid,killyosaur/ag-grid,ceolter/ag-grid,ceolter/angular-grid,seanlandsman/ag-grid,makinggoodsoftware/ag-grid,ceolter/angular-grid,seanlandsman/ag-grid