[API REVIEW] RT-17645: Make Image class support exceptions for both asynchronous and synchronous loading

[LUBOMIR NERAD]

Hi All,

the RT-17645 was already discussed several times in the context of image 
loader API. The decision after internal discussions was not to add image 
loader API yet and to address the RT-17645 by simply adding an exception 
property to the Image class.

So the proposed API is:

public final Exception getException();
public final ReadOnlyObjectProperty<Exception> exceptionProperty();

Link to the Jira issue:

https://javafx-jira.kenai.com/browse/RT-17645

Thanks,
Lubo