Refactored object manager API's to de-emphasize delegates and removal duplication of blocks and delegates. Added block callbacks to RKObjectLoader.

Code/Network/RKRequest.m

@@ -64,6 +64,8 @@
 @synthesize timeoutInterval = _timeoutInterval;
 @synthesize reachabilityObserver = _reachabilityObserver;
 @synthesize configurationDelegate = _configurationDelegate;
+@synthesize onDidLoadResponse;
+@synthesize onDidFailLoadWithError;
 
 #if TARGET_OS_IPHONE
 @synthesize backgroundPolicy = _backgroundPolicy, backgroundTaskIdentifier = _backgroundTaskIdentifier;
@@ -167,6 +169,10 @@
     _OAuth2AccessToken = nil;
     [_OAuth2RefreshToken release];
     _OAuth2RefreshToken = nil;
+    [onDidFailLoadWithError release];
+    onDidFailLoadWithError = nil;
+    [onDidLoadResponse release];
+    onDidLoadResponse = nil;
     [self invalidateTimeoutTimer];
     [_timeoutTimer release];
     _timeoutTimer = nil;
@@ -565,6 +571,10 @@
 			[_delegate request:self didFailLoadWithError:error];
 		}
         
+        if (self.onDidFailLoadWithError) {
+            self.onDidFailLoadWithError(error);
+        }
+        
         NSDictionary* userInfo = [NSDictionary dictionaryWithObject:error forKey:RKRequestDidFailWithErrorNotificationUserInfoErrorKey];
 		[[NSNotificationCenter defaultCenter] postNotificationName:RKRequestDidFailWithErrorNotification 
                                                             object:self 
@@ -600,6 +610,10 @@
 		[_delegate request:self didLoadResponse:finalResponse];
 	}
     
+    if (self.onDidLoadResponse) {
+        self.onDidLoadResponse(finalResponse);
+    }
+    
     if ([response isServiceUnavailable]) {
         [[NSNotificationCenter defaultCenter] postNotificationName:RKServiceDidBecomeUnavailableNotification object:self];
     }