Improvements
- Adds new API 
+[NewRelic recordCustomEvent:(NSString*)eventType withAttributes:(NSDictionary*)attributes] 
This method replaces +[NewRelic recordEvent:(NSString*)name withAttributes:(NSDictionary*)attributes] which is now deprecated, with the intention of removal in the future. The new API creates a new event with an event type specified by the eventType parameter, whereas the deprecated method create a event with the Mobile event type and an attribute with the name 'name' and the value of the name parameter. This change satisfies customer requests for:
- Improved Insights query performance
 - Defining custom event types
 - Finding custom event in Insights more easily
 - Flexibility to define data retention per custom event type