Minor changes: remove unncessary imports and add a new line ad the end of ASInternalHelpers.h

AsyncDisplayKit/ASDisplayNode.mm

@@ -11,7 +11,6 @@
 #import "ASDisplayNodeInternal.h"
 
 #import <objc/runtime.h>
-#import <stack>
 
 #import "_ASAsyncTransaction.h"
 #import "_ASPendingState.h"

AsyncDisplayKit/ASEditableTextNode.mm

@@ -16,8 +16,6 @@
 #import "ASTextNodeWordKerner.h"
 #import "ASThread.h"
 
-#import "ASLayoutSpec.h"
-
 //! @abstract This subclass exists solely to ensure the text view's panGestureRecognizer never begins, because it's sporadically enabled by UITextView. It will be removed pending rdar://14729288.
 @interface _ASDisabledPanUITextView : UITextView
 @end

AsyncDisplayKit/ASTextNode.mm

@@ -19,8 +19,6 @@
 #import "ASTextNodeRenderer.h"
 #import "ASTextNodeShadower.h"
 
-#import "ASLayoutSpec.h"
-
 static const NSTimeInterval ASTextNodeHighlightFadeOutDuration = 0.15;
 static const NSTimeInterval ASTextNodeHighlightFadeInDuration = 0.1;
 static const CGFloat ASTextNodeHighlightLightOpacity = 0.11;

AsyncDisplayKitTests/ASInsetLayoutSpecSnapshotTests.mm

@@ -12,8 +12,6 @@
 
 #import "ASBackgroundLayoutSpec.h"
 #import "ASInsetLayoutSpec.h"
-#import "ASStaticLayoutSpec.h"
-
 
 typedef NS_OPTIONS(NSUInteger, ASInsetLayoutSpecTestEdge) {
   ASInsetLayoutSpecTestEdgeTop    = 1 << 0,