* Check in ASLayout if size is valid for sizing instead of valid for layout
* Return constrainedSize from calculateSizeThatFits:
Remove invalid constrainedSize check within ASNetworkImageNode. Furthermore as ASDisplayNode does not return CGSizeZero anymore we have to give the display nodes we use in tests and are involving a stack spec an intrinsic content size.
* Remove extra constrainedSize handling in ASNetworkImageNode handling
* Change test to use FLT_MAX