rework for GridList and DataGridList

Enyo-DCO-1.1-Signed-off-by: Cole Davis <cole.davis@lge.com>
Add selected property back to GridListImageItem so existing sample will continue to work

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #40 from enyojs/pilot-5-cleanup

rework for GridList and DataGridList

Reviewed-By: Ben Combee (ben.combee@lge.com)