ENYO-3891: Allow for horizontal scrolling from mousewheel event

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
Merge pull request #691 from enyojs/ENYO-3891-aarontam

ENYO-3891: Allow for horizontal scrolling from mousewheel event

Reviewed-By: Ben Combee (ben.combee@lge.com)