Switches to JOGL 2.0.2 RC 20130425 and allows to control the creation of the renderer in the canvas renderer

The second change is nice, it fixes the issue #41. However, the first one is a bit problematic. The class PBuffer will be removed from JOGL 2 very soon but GLOffscreenAutoDrawable.PBuffer hasn't been implemented yet. JoglPbufferTextureRenderer doesn't work as is. I'm going to write a RFE against JOGL but we have to keep in mind that pbuffers RTT weren't working under Linux and most of the time, the use of FBOs is more suitable.