GridFieldSortableRows adapted to use Versioned extension.
Merge pull request #1 from daniquilez/patch-1

GridFieldSortableRows adapted to use Versioned extension.
Merge branch 'master' of https://github.com/arillo/SortableGridField

# By daniquilez
# Via banglashi (1) and daniquilez (1)
* 'master' of https://github.com/arillo/SortableGridField:
  GridFieldSortableRows adapted to use Versioned extension.