Enable JSHint es3 mode to find trailing commas
fix instance of that in SubmenuSample.js

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #162 from enyojs/jshint-fix-trailing-commas

Enable JSHint es3 mode to find trailing commas
ENYO-2265: button margin is required for FF
ENYO-2265: Fix tab removal corner cases
ENYO-2265: fixed indentation
ENYO-2265: Compiled css
ENYO-2265: Merge remote-tracking branch 'origin/master' into ENYO-2265