BHV-743: Adjust scroller edge when navigating to first or last row.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
BHV-743: Moving DataGridList-specific code away from general DataList handling.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
BHV-743: Update variable names

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
Merge pull request #1312 from enyojs/BHV-743-aarontam

BHV-743: Adjust scroller edge when navigating to first or last row.

Reviewed-By: Cole Davis (cole.davis@lge.com)