2.5.0
Bumping copyright year
[Issue #2381] Using static char declaration pointers for associated object keys in UIButton category
AFImageCache protocol should inherit from NSObject
[Issue #2187][Issue #2245][Issue #2255] Adding image cache and response serializer properties to UIButton category, as well as cancelling image request operations correctly on a per-state basis
Import UIRefreshControl+AFNetworking
Adding explicit casts and #pragma ignore to fix warnings about out-of-range enumerated type value assignment
Adding UIRefreshControl+AFNetworking
Refactor state of refresh control using task