Add "es3":true to .jshintrc to detect trailing commas, which cause problems in IE8 and also violate Enyo style guidelines
Cleanup trailing commas in several files

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #340 from enyojs/jshint-cleanup

Add "es3":true to .jshintrc to detect trailing commas, which cause probl...