Added CoreData.h import to main RestKit header. Updated quick start installation language.

Code/RestKit.h

@@ -21,6 +21,7 @@
 #import "Network.h"
 #import "Support.h"
 #import "ObjectMapping.h"
+#import "CoreData.h"
 
 /**
  Set the App logging component. This header

README.md

@@ -63,11 +63,14 @@ Installation
 Quick Start (aka TL;DR)
 -----------
 
+RestKit assumes that you are using a modern Xcode project building to the DerivedData directory. Confirm your settings
+via the "File" menu > "Project Settings...". On the "Build" tab within the sheet that opens, click the "Advanced..."
+button and confirm that your "Build Location" is the "Derived Data Location".
+
 1. Add Git submodule to your project: `git submodule add git://github.com/RestKit/RestKit.git RestKit`
 1. Add cross-project reference by dragging **RestKit.xcodeproj** to your project
 1. Open build settings editor for your project
 1. Add **Other Linker Flags** for `-ObjC -all_load`
-1. Add **Header Search Path** for `$(SOURCE_ROOT)/RestKit/Build`
 1. Open target settings editor for the target you want to link RestKit into
 1. Add direct dependency on the **RestKit** aggregate target
 1. Link against required frameworks: