CKMappingContext : Supports custom transformer on collections and array

Ugly copy/pasted code that needs to be refactored later but it works for now.
Added CKTransitions for slide in from top and slide away from top
Merge pull request #31 from wherecloud/TransitionSlideFromTop

Added CKTransitions for slide in from top and slide away from top
Increments build number to 2.4.2