Functioning Preload range

Refactor how we do ranges so they can be arbitrarily managed. Introduce the concept of a preload range.

AsyncDisplayKit/ASDisplayNode.h

@@ -312,7 +312,7 @@ typedef CALayer *(^ASDisplayNodeLayerBlock)();
 - (void)recursivelySetDisplaySuspended:(BOOL)flag;
 
 /**
- * @abstract Calls -reclaimMemory on the receiver and its subnode hierarchy.
+ * @abstract Calls -clearRendering on the receiver and its subnode hierarchy.
  *
  * @discussion Clears backing stores and other memory-intensive intermediates.
  * If the node is removed from a visible hierarchy and then re-added, it will automatically trigger a new asynchronous display,
@@ -322,7 +322,18 @@ typedef CALayer *(^ASDisplayNodeLayerBlock)();
  * @see displaySuspended and setNeedsDisplay
  */
 
-- (void)recursivelyReclaimMemory;
+- (void)recursivelyClearRendering;
+
+/**
+ * @abstract Calls -clearRemoteData on the receiver and its subnode hierarchy.
+ *
+ * @discussion Clears any memory-intensive fetched content.
+ * This method is used to notify the node that it should purge any content that is both expensive to fetch and to
+ * retain in memory.
+ *
+ * @see fetchRemoteData
+ */
+- (void)recursivelyClearRemoteData;
 
 /**
  * @abstract Toggle displaying a placeholder over the node that covers content until the node and all subnodes are
@@ -539,5 +550,9 @@ typedef CALayer *(^ASDisplayNodeLayerBlock)();
 @end
 
 @interface ASDisplayNode (Deprecated)
+
+- (void)reclaimMemory ASDISPLAYNODE_DEPRECATED;
+- (void)recursivelyReclaimMemory ASDISPLAYNODE_DEPRECATED;
 @property (nonatomic, assign) BOOL placeholderFadesOut ASDISPLAYNODE_DEPRECATED;
+
 @end