BHV-14565: Do not pass shared event object references when firing custom event.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
BHV-14565: Add documentation.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
Merge pull request #106 from enyojs/BHV-14565-aarontam

BHV-14565: Do not pass shared event object references when firing custom event.

Reviewed-By: Roy Sutton (roy.sutton@lge.com)
Integrated-By: Gray Norton (gray.norton@lge.com)