Fix: -renderbucket-size value not applied to GPU render (#256)

* Fix: -renderbucket-size option not applied if configuration file doesn't exist

src/com/sheepit/client/hardware/cpu/CPU.java

@@ -20,6 +20,7 @@
 package com.sheepit.client.hardware.cpu;
 
 public class CPU {
+	final public static int MIN_RENDERBUCKET_SIZE = 32;
 	private String name;
 	private String model;
 	private String family;