Exposing the column being sorted 
Exposing the column being sorted 

#5692 Exposing the column being sorted.
https://github.com/angular-ui/ui-grid/issues/5692
dbckr/ui-grid,bjossi86/ui-grid,angular-ui/ui-grid,Servoy/ng-grid,angular-ui/ui-grid,bjossi86/ui-grid,kenwilcox/ui-grid,angular-ui/ng-grid,kenwilcox/ui-grid,AgDude/ng-grid,Servoy/ng-grid,dbckr/ui-grid,mportuga/ui-grid,kamikasky/ui-grid,InteractiveIntelligence/ng-grid,dlgski/ui-grid,ntmuigrid/ntmuigrid,angular-ui/ng-grid,angular-ui/ui-grid,kamikasky/ui-grid,mportuga/ui-grid,dlgski/ui-grid,AgDude/ng-grid,dlgski/ui-grid,angular-ui/ng-grid,Servoy/ng-grid,kamikasky/ui-grid,dbckr/ui-grid,bjossi86/ui-grid,InteractiveIntelligence/ng-grid,mportuga/ui-grid,ntmuigrid/ntmuigrid,ntmuigrid/ntmuigrid,AgDude/ng-grid,kenwilcox/ui-grid,InteractiveIntelligence/ng-grid