Culling does not work with y-down set to true in OrthographicCamera

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Set OrthographicCamera to be y-down
2. Enable culling in RayHandler instance
3. Moving camera around causes lights to come in and out within view-able area.

What is the expected output? What do you see instead?
Expect culling on to disable lights outside of the viewport. Instead, lights 
come on and off within the viewport.

What version of the product are you using? On what operating system?
Nightly LibGDX and nightly box2dlights.

Please provide any additional information below.

Original issue reported on code.google.com by sondun2...@gmail.com on 4 Jan 2014 at 11:25