zero size is default for sizeToFit in generic nodes

Author: psharanda

LayoutOps/LayoutOps/Node.swift

@@ -70,7 +70,7 @@ public class AnyNode: Layoutable {
     public var frame: CGRect = CGRect()
 
     public func sizeThatFits(size: CGSize) -> CGSize {
-        return size
+        return CGSize()
     }
 
     private var subnodes: [AnyNode]

LayoutOps/LayoutOps/UIView+Layoutable.swift

@@ -34,7 +34,7 @@ extension CALayer: Layoutable {
     }
 
     public func sizeThatFits(size: CGSize) -> CGSize {
-        return size
+        return CGSize()
     }
 }