GF-6106: add Enyo platform check for webOS 4 / Open webOS via Isis/WebAppManager

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #356 from enyojs/GF-6106-unwiredben

GF-6106: add Enyo platform check for webOS 4 / Open webOS, indicated by WebA...

Reviewed-By: Cole Davis (cole.davis@lge.com)