Setup a default managedObjectCache instance of RKFetchRequestManagedObjectCache

Code/CoreData/RKManagedObjectStore.h

@@ -218,6 +218,8 @@ extern NSString * const RKSQLitePersistentStoreSeedDatabasePathOption;
 
  The managed object cache is used to accelerate intensive Core Data operations by
  caching managed objects by their primary key value.
+ 
+ **Default**: An instance of `RKFetchRequestManagedObjectCache`.
 
  @see RKManagedObjectCaching
  @warning A nil managed object cache will result in a store that is unable to uniquely identify

Code/CoreData/RKManagedObjectStore.m

@@ -64,6 +64,7 @@ static RKManagedObjectStore *defaultStore = nil;
     self = [super init];
     if (self) {
         self.managedObjectModel = managedObjectModel;
+        self.managedObjectCache = [RKFetchRequestManagedObjectCache new];
 
         // Hydrate the defaultStore
         if (! defaultStore) {

Code/Network/RKObjectRequestOperation.m

@@ -50,7 +50,6 @@ static inline NSString * RKDescriptionForRequest(NSURLRequest *request)
     }
     
     return self;
-    RKHTTPRequestOperation *operation = [[RKHTTPRequestOperation alloc] initWithRequest:request];
 }
 
 - (void)setSuccessCallbackQueue:(dispatch_queue_t)successCallbackQueue