Trailing whitespace cleanup from files in the Code directory.

Used the following command from within the Code dir:
git ls-files *.m *.h *.json | xargs /usr/bin/sed -i '' -E 's/[[:space:]]*$//'

Code/CoreData/RKInMemoryManagedObjectCache.h

@@ -19,7 +19,7 @@
  Initializes the receiver with a managed object context that is to be observed
  and used to populate the in memory cache. The receiver may then be used to fulfill
  cache requests for child contexts of the given managed object context.
- 
+
  @param managedObjectContext The managed object context with which to initialize the receiver.
  @return The receiver, initialized with the given managed object context.
  */