Added private header for BLYEvent
Import BLYEvent in Bully.h
Store the id and secret in the client
Removed global credentials from BLYEvent
Updated request creation API to use the passed values.
Removed the trigger methods
Changed the BLYEvent class constructor to closer match the API example on http://pusher.com/docs/server_api_guide/interact_rest_api#/lang=rb
Added trigger & initializer to the client for events.