BHV-8481: Use delegate pattern for FlyweightRepeater.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
Merge pull request #90 from enyojs/BHV-8481-aarontam

BHV-8481 and BHV-8486: Use delegate pattern for FlyweightRepeater.