ENYO-3928: Expose API for triggering event handler on a control.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
ENYO-3928: Use enyo.cloneArray instead of Array slice.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
ENYO-3928: Make triggerHandler a local API.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
Merge pull request #687 from enyojs/ENYO-3928-aarontam

ENYO-3928: Expose API for triggering event handler on a control.

Reviewed-By: Cole Davis (cole.davis@lge.com)