ANG-8910: Accordion should bind disabled property into headerWrapper

Fixing http://jira2.lgsvl.com/browse/ANG-8910

DCO-1.1-Signed-Off-By: Kunmyon Choi kunmyon.choi@lge.com
Removing unnecessary comma in the Accordion Sample
Merge pull request #1334 from enyojs/ANG-8910-kunmyonchoi

ANG-8910: Accordion should bind disabled property into headerWrapper