Fixed the Generic popup so that the auto hide is
optional and also fixed the datagrid to hide the
transparrent scroller in chrome

issue: A24Group/Triage#3829
Added the loading icon reindication for the
generic popup

issue: A24Group/Triage#3829
Fixed the param prefix and added it's doc blocks

issue: A24Group/Triage#3829
Merge pull request #222 from A24Group/feature-update-ssGWT-Datagrid-and-Popup-3829

Fixed the Generic popup and SSDatagrid shortcomings