angular-ui/ng-grid — pull request #2464 by mathiasdose (2014-12-29 17:01:47+00:00)
Title: Enh(cellNav) #2186 select multiple cells

Add modifierKeysToMultiSelectCells option which enables user to,
when including cellNav, hold the modifier key to select multiple
cells with the mouse. Add API method getCurrentSelection which
enables the user to get the cells currently selected.