Rework code that cloned events for hold/holdPulse to avoid affecting srcEvent on the initial event going through the tree, as this crashed code in ImageView

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #297 from enyojs/fix-hold-events

Rework code that cloned events for hold/holdPulse to avoid affecting src...

Reviewed-By: Gray Norton <gray.norton@lge.com>