All column headers were receiving the ngSorted style. This is because existing code only tests for the existence of a noSortVisible function. we should be executing the function.
Merge branch 'aggressiveNgSorted' of https://github.com/bradlund/ng-grid into bradlund-aggressiveNgSorted
Merge branch 'bradlund-aggressiveNgSorted' into 2.0.8