Export NSObject+RACDeallocating.h

I apologize for previous pull request #376 mistake.
I had add NSObject+RACDeallocating.h, but I did not export this header correctly,
so You can not import this header on iOS build. (probably ok on OSX)
I would like to use this header on iOS.
This is the fix.

I had check Xcode Build Phases > Copy Headers, and here is diff summary:
prefix - is exported on OSX only.
prefix + is exported on iOS only.

I fixed:
-NSObject+RACDeallocating.h

only OSX is correct?
-NSInvocation+RACTypeParsing.h
-NSObject+RACKVOWrapper.h

Should private?
-RACBlockTrampoline.h
-RACImmediateScheduler.h
-RACKVOTrampoline.h
-RACQueueScheduler.h
-RACSubscriptionScheduler.h
+RACArraySequence.h
+RACDynamicSequence.h
+RACEagerSequence.h
+RACEmptySequence.h
+RACSignalSequence.h
+RACStringSequence.h

OK only OSX:
-NSControl+RACCommandSupport.h
-NSControl+RACTextSignalSupport.h
-NSObject+RACAppKitBindings.h
-NSText+RACSignalSupport.h

OK only iOS:
+UIControl+RACSignalSupport.h
+UITextField+RACSignalSupport.h
+UITextView+RACSignalSupport.h