BHV-10443 : Moonstone Component Bug for ExpandableListItem

Bug: Although header text area is tapped with 5-way button, the drawer does not open.
Fix: SpotlightFocus and tap event handling point are moved from header component to headerContainer component

DCO-1.1-Signed-Off-By: SoonGil Choi soongil.choi@lge.com
Add ExpandableListItemSample application(.js, .css, .html)
Add the up arrow displaying routin with/without spotlight when picker is open
Add 'Disabled ListItem' example in ExpandableListItemSample
BHV-10443: Remove unnecessary binding.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
Merge pull request #1499 from enyojs/BHV-10443-soongil-RC

BHV-10443 : Moonstone Component Bug for ExpandableListItem. - RC