Use new webOSLocaleChange event instead of sub

WebAppManager just introduced a new webOSLocaleChange event
that informs client apps when the user has changed the language
or region of the device. It's more efficient to wait for it
than to make a service bus subscription.

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #37 from webOS-DevRel/use-event-for-localemonitor

Use new webOSLocaleChange event instead of sub