Update MCNotificationPost* functions to take StringRefs

The m_device_token and m_launch_url members of @interface MCIPhoneApplication were changed to StringRefs as was m_notification of MCNotificationEvent.
Fix silly mistakes

Fixed a couple of silly mistakes where the return value wasn't being set.
Merge pull request #179 from runrevfraser/refactor-syntax_unicode_mblnotification

Refactor syntax unicode mblnotification