ENYO-2227: Add platform detection for Blackberry playbook

Thanks to Olivier Salamin for the fix

Enyo=DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #382 from enyojs/ENYO-2227-unwiredben

ENYO-2227: Add platform detection for Blackberry playbook