#51 if size is a var, lookup the value

I think this could resolve issue #51, allowing size to be a var.  As far as I can tell, each time you need to access size you need to see if it's a var and if it is use var-get to obtain its value.  I saw notes in defapplet about wanting to be able to get the current value so it can be updated and tried to follow that.

I ran each of the examples to test it (with the exception of the opengl examples which I could not run, I don't have opengl set up for the jvm).

Does this work?