Support automatic images loading according to the "scale" naming convention on Windows.
Toolkit.getDefaultToolkit().getImage("name.ext") should also load the following images as resolution variants:
- name.scale-100.ext
- name.scale-140.ext
- name.scale-180.ext

http://msdn.microsoft.com/en-us/library/windows/apps/hh465362.aspx
http://msdn.microsoft.com/en-us/library/windows/apps/xaml/hh965325.aspx