Gwt notes - s76/libgdx GitHub Wiki
see http://www.badlogicgames.com/wordpress/?p=3073
speeding up GWT compile times: http://www.gamefromscratch.com/post/2013/10/07/Speeding-up-GWT-compilation-speeds-in-a-LibGDX-project.aspx
Important: if you use any kind of reflection then see: Reflection